Update quickstart for 'Contribute with Code'

The steps for a minimal dev setup were out of order. They also missed
some context to avoid confusion. Furthermore some of the links for "more
comprehensive guides" pointed at the current page instead of the
intended docs pages.

closes #7319

Author: DEiselt

CHANGES/7319.doc

@@ -0,0 +1 @@
+Fixed the quickstart instructions on how to contribute with code as well as links to more comprehensive guides.

docs/dev/tutorials/quickstart.md

@@ -15,28 +15,32 @@ It is a CLI tool that uses `docker/podman-compose` and [Pulp OCI Images](https:/
 To set it up, follow these steps:
 
 ```bash
-# 1. clone repos to the same basedir (pulpcore is required)
+# 1. clone required repos to the same basedir
 git clone https://github.com/pulp/oci_env.git
 git clone https://github.com/pulp/pulpcore.git
+git clone https://github.com/pulp/pulp-openapi-generator.git # required for 'generate-client' below
+
+# 1.1 add more repos as necessary to the same basedir
 git clone https://github.com/pulp/pulp_rpm.git
 
 # 2. install oci-env client
 cd oci_env
 pip3 install -e client
 
 # 3. use minimal compose.env
+# At least add pulpcore to DEV_SOURCE_PATH like this: DEV_SOURCE_PATH=pulpcore
 cp compose.env.example compose.env
 
-# 4. build the images and do basic setup
+# 4. build the images and start the service
 oci-env compose build
+oci-env compose up
+
+# 5. do basic setup
 oci-env generate-client -i
 oci-env generate-client -i pulp_file
-
-# 5. start the service
-oci-env compose up 
 ```
 
-A more comprehensive guide on setting up the dev environment is documented  [here](#).
+A more comprehensive guide on setting up the dev environment is documented  [here](site:oci_env/docs/dev/tutorials/quickstart/).
 
 ### 2. Make and test changes
 
@@ -52,11 +56,11 @@ oci-env test -i -p pulp_rpm functional
 oci-env test -p pulp_rpm functional -k test_mychages
 ```
 
-A more comprehensive guide on running tests is documented  [here](#).
+A more comprehensive guide on running tests is documented [here](site:oci_env/docs/dev/guides/run-tests/).
 
 ### 3. Update the changelog entry
 
-Pulp uses [towncrier](#) to manage its changelog.
+Pulp uses [towncrier](https://towncrier.readthedocs.io/en/stable/) to manage its changelog.
 
 It requires that you have a related GitHub issue number, except for trivial changes (such as typo fixes).
 In those cases the entry is no required at all. 
@@ -83,7 +87,7 @@ The changelog message should use past simple tense and describe the change being
     echo "Added API that allows users to export a repository version to disk." > CHANGES/plugin_api/3245.feature
     ```
 
-A more comprehensive guide on using towncrier in the Pulp project is documented  [here](#).
+A more comprehensive guide on using towncrier in the Pulp project is documented [here](site:pulpcore/docs/dev/guides/git/#changelog-update). 
 
 ### 4. Commit and Submit a PR
 
@@ -108,4 +112,4 @@ the worker configuration.
 closes #1392
 ```
 
-A more comprehensive guide on using git in the Pulp project is documented [here](#).
+A more comprehensive guide on using git in the Pulp project is documented [here](site:pulpcore/docs/dev/guides/git/).