Restructure Docs

[Andre601]

Restructures the current documentation.

Things left to do:

• Add redirects for old pages to new ones
• Add Git Integration page content
• Add GitLab Integration page content
• Add BitBucket Integration page content
• Add pages suggested in this PR

[gmitch215]

My apologies. I thought I tried to submit a review, not a commit...

[gmitch215]

70% Grammer, 30% Changes

[gmitch215]

Didn't edit everything else, only added the missing content from the TODO pages.

Information was borrowed from official documentation. BitBucket isn't implemented yet until @sgdc3 installs the BitBucket plugin. Feel free to directly change the files.

[sgdc3]

@gmitch215 bitbucket integration installed 👍

[Andre601]

I've now set up redirects for the old pages under the /jenkins/ subpage, to allow them still working in case they have been shared in the past.

One thing that is still left is updating the commit/build status integration for GitHub, as that one uses info that by the looks of it do no longer work with the current Jenkins implementation of CodeMC. I sadly don't know what the current/new aproach would be, if there still is one.

[gmitch215]

If @sgdc3 has nothing else, LGTM

[Andre601]

Made some final changes on my ends now. Namely I added the git-revision-date-localized and the git-committers plugins to use.
First will add the date of a page's last edit and its creation using the git history, which is useful for pages like the usage guidelines (See image below).
Second adds avatars of the users who edited the pages using GitHub API. Found this to be a nice way to give credists to contributors. It's disabled for environments without the right env vars set (See mkdocs.yml for the ones used).

I also updated the GitHub Actions Workflow to now use a direct deployment to GitHub pages which is usually faster and better to do. It will require to save the custom subdomain again in the repo settings so GitHub is aware of it being used as the CNAME file has no usage here using this aproach.
The gh-pages branch can also be removed after this.

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