docs: fix 17 broken links in manual, FAQ, and upgrade guide

Fixes scylladb/scylladb-docs-homepage#204

Straightforward fixes (typos / moved pages):
- faq/README.md, upgrade_guide/README.md: loadbalancing -> load_balancing path
- manual/core/non_blocking/README.md: remove trailing backtick from SyncCqlSession URL
- manual/developer/common/concurrency/README.md: same trailing backtick fix
- manual/core/reactive/README.md: remove trailing ] from DataStax devapp URL
- manual/core/statements/batch/README.md: http -> https; replace dead DSE 6.7 batch
  URL with canonical Cassandra CQL DML docs
- manual/core/query_timestamps/README.md: replace dead DSE 6.0 LWT URL with
  canonical Cassandra CQL DML docs
- manual/mapper/entities/README.md: fix malformed ?# anchor and update to current
  Cassandra DML docs URL
- manual/mapper/daos/queryprovider/README.md: add missing /entity/ path segment in
  EntityHelper Javadoc URL

Opinionated fixes (replacement content chosen):
- README.md: replace defunct maven-badges.herokuapp.com badge with shields.io
  pointing to central.sonatype.com
- manual/core/load_balancing/README.md: replace dead DataStax fault-tolerance
  whitepaper PDF with YouTube video (https://www.youtube.com/watch?v=NT2-i3u5wo0)
- manual/core/graalvm/README.md: update GraalVM native-image resources URL to
  current path; drop hyperlinks from DSE geotypes and DSE Graph entries (pages do
  not exist in the Scylla driver docs)
- manual/core/metrics/README.md: update Micrometer JMX registry URL to current
  docs.micrometer.io path
- manual/developer/netty_pipeline/README.md: rename '### InFlightHandler' heading
  to '### In-Flight Handler' to match the existing anchor reference in
  request_execution/README.md

Author: nikagra

README.md

@@ -1,6 +1,6 @@
 # Java Driver for Scylla and Apache Cassandra®
 
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.scylladb/java-driver-core/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.scylladb/java-driver-core)
+[![Maven Central](https://img.shields.io/maven-central/v/com.scylladb/java-driver-core)](https://central.sonatype.com/artifact/com.scylladb/java-driver-core)
 
 *If you're reading this on github.com, please note that this is the readme for the development 
 version and that some features described here might not yet have been released. You can find the

faq/README.md

@@ -100,7 +100,7 @@ This ability is considered a misfeature and has been removed from driver 4.0 onw
 However, due to popular demand, cross-datacenter failover has been brought back to driver 4 in
 version 4.10.0.
 
-If you are using a driver version >= 4.10.0, read the [manual](../manual/core/loadbalancing/) to
+If you are using a driver version >= 4.10.0, read the [manual](../manual/core/load_balancing/) to
 understand how to enable this feature; for driver versions < 4.10.0, this feature is simply not
 available.
 

manual/core/graalvm/README.md

@@ -29,8 +29,8 @@ under the License.
   * When using LZ4 [compression](../compression/);
   * Depending on the [logging backend](../logging) in use.
 * DSE-specific features:
-  * [Geospatial types](../dse/geotypes) are supported.
-  * [DSE Graph](../dse/graph) is not officially supported, although it may work.
+  * Geospatial types are supported.
+  * DSE Graph is not officially supported, although it may work.
 * The [shaded jar](../shaded_jar) is not officially supported, although it may work.
 
 -----
@@ -120,7 +120,7 @@ resources are all automatically included in the native image: you should not nee
 manually_. See [Accessing Resources in Native Images] for more information on how classpath 
 resources are handled in native images.
 
-[Accessing Resources in Native Images]: https://www.graalvm.org/reference-manual/native-image/Resources/
+[Accessing Resources in Native Images]: https://www.graalvm.org/latest/reference-manual/native-image/metadata/#resources
 
 ### Configuring the logging backend
 

manual/core/load_balancing/README.md

@@ -288,10 +288,10 @@ infrastructure. To resume our example above, if Region1 goes down, the load bala
 infrastructure would transparently switch all the traffic intended for that region to Region2,
 possibly scaling up its bandwidth to cope with the network traffic spike. This is by far the best
 solution for the cross-datacenter failover issue in general, but we acknowledge that it also
-requires a purpose-built infrastructure. To help you explore this option, read our [white paper].
+requires a purpose-built infrastructure. To help you explore this option, watch our [white paper].
 
 [application-level failover example]: https://github.com/scylladb/java-driver/blob/scylla-4.x/examples/src/main/java/com/datastax/oss/driver/examples/failover/CrossDatacenterFailover.java
-[white paper]: https://www.datastax.com/sites/default/files/content/whitepaper/files/2019-09/Designing-Fault-Tolerant-Applications-DataStax.pdf
+[white paper]: https://www.youtube.com/watch?v=NT2-i3u5wo0
 
 #### Token-aware
 

manual/core/metrics/README.md

@@ -363,6 +363,6 @@ CSV files, SLF4J logs and Graphite. Refer to their [manual][Dropwizard manual] f
 [Dropwizard Metrics]: https://metrics.dropwizard.io/4.1.2
 [Dropwizard Manual]: https://metrics.dropwizard.io/4.1.2/getting-started.html
 [Micrometer Metrics]: https://micrometer.io/docs
-[Micrometer JMX]: https://micrometer.io/docs/registry/jmx
+[Micrometer JMX]: https://docs.micrometer.io/micrometer/reference/implementations/jmx.html
 [MicroProfile Metrics]: https://github.com/eclipse/microprofile-metrics
 [reference configuration]: ../configuration/reference/

manual/core/non_blocking/README.md

@@ -68,7 +68,7 @@ For example, calling any synchronous method declared in [`SyncCqlSession`], such
 will block until the result is available. These methods should never be used in non-blocking 
 applications.
 
-[`SyncCqlSession`]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/SyncCqlSession.html`
+[`SyncCqlSession`]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/SyncCqlSession.html
 [`execute`]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/SyncCqlSession.html#execute-com.datastax.oss.driver.api.core.cql.Statement-
 
 However, the asynchronous methods declared in [`AsyncCqlSession`], such as [`executeAsync`], are all 

manual/core/query_timestamps/README.md

@@ -210,5 +210,5 @@ Here is the order of precedence of all the methods described so far:
 
 [gettimeofday]: http://man7.org/linux/man-pages/man2/settimeofday.2.html
 [JNR]: https://github.com/jnr/jnr-posix
-[Lightweight transactions]: https://docs.datastax.com/en/dse/6.0/cql/cql/cql_using/useInsertLWT.html
+[Lightweight transactions]: https://cassandra.apache.org/doc/latest/cassandra/developing/cql/dml.html#insert-statement
 [Statement.setQueryTimestamp()]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/Statement.html#setQueryTimestamp-long-

manual/core/reactive/README.md

@@ -402,7 +402,7 @@ more fine-grained control of what should be retried, and how, is required.
 [built-in retry mechanism]: ../retries/
 [request throttling]: ../throttling/
 
-[Managing concurrency in asynchronous query execution]: https://docs.datastax.com/en/devapp/doc/devapp/driverManagingConcurrency.html]
+[Managing concurrency in asynchronous query execution]: https://docs.datastax.com/en/devapp/doc/devapp/driverManagingConcurrency.html
 [Publisher]: https://www.reactive-streams.org/reactive-streams-1.0.2-javadoc/org/reactivestreams/Publisher.html
 [reactive streams]: https://en.wikipedia.org/wiki/Reactive_Streams
 [Reactive Streams API]: https://github.com/reactive-streams/reactive-streams-jvm

manual/core/statements/batch/README.md

@@ -83,5 +83,5 @@ to execute such a batch, an `IllegalArgumentException` is thrown.
 [BatchStatement]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/BatchStatement.html
 [BatchStatement.newInstance()]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/BatchStatement.html#newInstance-com.datastax.oss.driver.api.core.cql.BatchType-
 [BatchStatement.builder()]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/BatchStatement.html#builder-com.datastax.oss.driver.api.core.cql.BatchType-
-[batch_dse]: http://docs.datastax.com/en/dse/6.7/cql/cql/cql_using/useBatch.html
+[batch_dse]: https://cassandra.apache.org/doc/latest/cassandra/developing/cql/dml.html#batch-statement
 [CASSANDRA-10246]: https://issues.apache.org/jira/browse/CASSANDRA-10246

manual/developer/common/concurrency/README.md

@@ -121,7 +121,7 @@ public interface ExecutionInfo {
 When a public API method is blocking, this is generally clearly stated in its javadocs. 
 
 [`ExecutionInfo.getQueryTrace()`]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/ExecutionInfo.html#getQueryTrace--
-[`SyncCqlSession`]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/SyncCqlSession.html`
+[`SyncCqlSession`]: https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/SyncCqlSession.html
 
 `BlockingOperation` is a utility to check that those methods aren't called on I/O threads, which
 could introduce deadlocks.