Redirect all remaining pages to HelpHub where possible

[tellyworth]

Currently we have stub pages on Codex like this one:

​https://codex.wordpress.org/New_To_WordPress_-_Where_to_Start

It includes a "this page has moved to" link, but doesn't automatically redirect. I believe it was done this way in order to retain the locale list on that page that links to translated versions of it such as ​https://codex.wordpress.org/es:Nuevo_en_WordPress_-_Por_dónde_empezar.

We should 30x redirect as many of these as possible to equivalent HelpHub pages. This probably requires building a table (spreadsheet, csv?) listing every page that needs to be redirected. Perhaps something like:

https://codex.wordpress.org/New_To_WordPress_-_Where_to_Start, 301, https://wordpress.org/support/article/new-to-wordpress-where-to-start/
https://codex.wordpress.org/es:Nuevo_en_WordPress_-_Por_dónde_empezar, 301, https://es.wordpress.org/support/article/new-to-wordpress-where-to-start/

Additionally there are other non-stub pages that should be redirected or retired. For example:

​https://codex.wordpress.org/FAQ
​https://codex.wordpress.org/Advanced_Topics
​https://codex.wordpress.org/Developer_Documentation

Some of these are category pages, some not. Ideally, anything that can be redirected to HelpHub or other documentation, should be redirected. We'll need destinations for those, whether it's part of the same list or something else manually created. It might also be helpful to have a list of remaining pages, so they can be manually dealt with.

See also #5680, #4487