docs: update and extend instructions (codeready-toolchain#1223)

* docs: update and extend instructions

The instructions could use a little refactor to include some of the
missing steps which are required to successfully run the E2E tests for
Developer Sandbox.

* docs: rename CRC as OpenShift local

CodeReady Containers was the old name for the "OpenShift local" product
form nowadays, so it does not make sense to have it lying around the
docs anymore.

* docs: create Quay repositories with "e2e run"

The "e2e run" target also creates all the repositories for the user, and
then they only have to make them public. Adding a note as an alternative
to manage those repositories in case the user wants to follow that path
instead.

---------

Co-authored-by: Matous Jobanek <mjobanek@redhat.com>

Author: MikelAlejoBR

CRC.adoc

@@ -13,7 +13,7 @@ This repository uses https://github.com/golang/go/wiki/Modules[Go modules].
 
 == Step by step guide - running in CodeReady Containers
 
-Refer to link:CRC.adoc[this guide] for detailed instructions on running the e2e tests in a local CodeReady Containers cluster.
+Refer to link:openshift_local.adoc[this guide] for detailed instructions on running the e2e tests in a local CodeReady Containers cluster.
 
 == End-to-End Tests