Add redirects for all of automation-controller docs to their respective index page

[tvo318]

We deleted all the source files from the product-docs in 4.5 except for the index.rst for each guide:

• https://docs.ansible.com/automation-controller/(4.5|latest)/html/administration/
• https://docs.ansible.com/automation-controller/(4.5|latest)/html/controllerapi/
• https://docs.ansible.com/automation-controller/(4.5|latest)/html/quickstart/
• https://docs.ansible.com/automation-controller/(4.5|latest)/html/towerapi/
• https://docs.ansible.com/automation-controller/(4.5|latest)/html/upgrade-migration-guide/
• https://docs.ansible.com/automation-controller/(4.5|latest)/html/userguide/

Users might still have bookmarks to individual chapters like https://docs.ansible.com/automation-controller/4.5/html/userguide/organizations.html. These chapters need to have redirects to the main guide's index file so readers can determine how to look for the latest information.

Example source for the userguide for 4.5: https://github.com/ansible/product-docs/tree/release_4.5/userguide/source
There should be no artifacts for any other chapters but the index.html file.

Source for redirects: https://github.com/ansible/docsite/blob/main/.htaccess
Test redirects at: https://htaccess.madewithlove.com/

[oraNod]

@tvo318 This redirect rule seems to work:

RedirectMatch permanent "automation-controller/latest/html/administration/(.*)$" "automation-controller/latest/html/administration/index.html"

You can test that here: https://htaccess.madewithlove.com/

Try filling in a {4.5, latest} url that should be redirected, such as https://docs.ansible.com/automation-controller/latest/html/administration/license-support.html

[oraNod]

@tvo318 Do you think this overlaps or resolves #184 ?