docs: drop list.rst and code behind it

[keradus]

We have 2 docs for rules:

• doc A: https://cs.symfony.com/doc/rules/index.html
• doc B: https://cs.symfony.com/doc/list.html

doc B is not listed anywhere, it's big and clumsy, 2 files are same purpose - index of rules that one can find what they look for and go for fixer details page if needed.

I suggest we drop doc B

[coveralls]

coverage: 94.784% (+0.3%) from 94.488%
when pulling a0b5508 on keradus:doc_list
into 2aee1c2 on PHP-CS-Fixer:master.

[Wirone]

In general I agree, the simpler page (variant A) is enough for explaining what each rule does, and when anyone can look deeper, then can go the rule's page. I would only ask if it's possible to make some redirect from the B's URL to A's? If not then it's OK too 😉.

(not giving approval because auto-merge is enabled, and I leave an option for suggestion above)

[keradus]

redirection on repo files:

• we could put symlink or sth, but not sure if any value in this.

---

redirection on website:

• I do not know how to do this redirection technically on github pages,

yet... ref

doc B is not listed anywhere

meaning:

• doc B is NOT linked anywhere on our official repos or on website itself. Only way to access it is to provide given URL in browser's web address field manually

[Wirone]

Yeah, I got that it's not linked anywhere, I was thinking only about places outside of the docs where it could be linked. It's not a big deal if it can't be linked. In Hugo pages can have aliases so some kind of "redirector" pages are generated alongside the actual ones, I was wondering if it's possible to apply similar approach with <meta http-equiv="refresh" content="0; url=..."> here. Feel free to merge without this, it's only nice to have 🙂.

[keradus]

likely there is possibility to have it on whatever generating website nowadays (or added on top of it).
if you know how or eager to figure it out - please go ahead and propose such PRs, i will happily merge it ;)
unfortunately, out of the blue I am not familiar with it, and I think that effort would be lost time.
overall, we use veeeeery old Sphinx...