Change file names in documentation and fix redirects

[DanielNoord]

Reverts #6647

[DanielNoord]

Link that need to work before we merge (will update):
Works:
https://pylint--6651.org.readthedocs.build/en/6651/intro.html
https://pylint--6651.org.readthedocs.build/en/6651/support.html
https://pylint--6651.org.readthedocs.build/en/6651/user_guide/ide-integration.html
https://pylint--6651.org.readthedocs.build/en/6651/additional_commands/index.html
https://pylint--6651.org.readthedocs.build/en/6651/user_guide/message-control.html
https://pylint--6651.org.readthedocs.build/en/6651/messages/messages_list.html
https://pylint--6651.org.readthedocs.build/en/6651/messages/messages_introduction.html

Doesn't work, but isn't broken:
https://pylint--6651.org.readthedocs.build/en/6651/user_guide/message-control.html#block-disables

[coveralls]

Pull Request Test Coverage Report for Build 2351123794

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.353%

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Totals
Change from base Build 2351089732:	0.0%
Covered Lines:	16066
Relevant Lines:	16849

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💛 - Coveralls

[Pierre-Sassoulas]

https://pylint--6651.org.readthedocs.build/en/6651/messages/fatal/config-parse-error.html Does not work

#6651 (comment)

[DanielNoord]

https://pylint--6651.org.readthedocs.build/en/6651/messages/fatal/config-parse-error.html Does not work

Fixed. I need to setup the directory redirects for every individual PR as they can only be set up for /en/VERSION/ which is normally /en/latest/. Made a typo with the redirect for this PR.