docs: overall minor renovations (#1874)

* docs: simplify README.md and make index.md to refer to it
* docs: change order for pages in navigation and add missing pages
* docs: fix headings to improve navigation, transform notes to admonition, fix indentation, linting issues and minor issues
* docs: merge docs for using images from private registries
* docs: add example to integrate LDAP configuration via extra_settings_files
* Apply suggestions from code review
docs: apply suggested changes

Co-authored-by: Don Naro <dnaro@redhat.com>

* docs: update the doc site url as same as the url in https://www.ansible.com/ecosystem/
* docs: minor fixes for hpa page
* docs: expand note block
* docs: apply #1904 to README.md

---------

Co-authored-by: Don Naro <dnaro@redhat.com>

docs/uninstall/uninstall.md

@@ -1,12 +1,13 @@
-### Uninstall ###
+# Uninstall
 
 To uninstall an AWX deployment instance, you basically need to remove the AWX kind related to that instance. For example, to delete an AWX instance named awx-demo, you would do:
 
-```
+```sh
 $ kubectl delete awx awx-demo
 awx.awx.ansible.com "awx-demo" deleted
 ```
 
 Deleting an AWX instance will remove all related deployments and statefulsets, however, persistent volumes and secrets will remain. To enforce secrets also getting removed, you can use `garbage_collect_secrets: true`.
 
-**Note**: If you ever intend to recover an AWX from an existing database you will need a copy of the secrets in order to perform a successful recovery.
+!!! note
+    If you ever intend to recover an AWX from an existing database you will need a copy of the secrets in order to perform a successful recovery.