Fix broken website redirects

[cortinico]

It seems like after #3199 (or even before?) we broke redirects.

https://detekt.github.io/detekt/kotlindsl.html should redirect to https://detekt.github.io/detekt/gradle.html. See:

detekt/docs/pages/gettingstarted/gradle.md

Lines 7 to 9 in cd659ce

	redirect_from:
	- /groovydsl.html
	- /kotlindsl.html

This is broken right now, I'm fixing it.

[codecov]

Codecov Report

Merging #3227 (559f0cc) into master (cd659ce) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #3227   +/-   ##
=========================================
  Coverage     80.10%   80.10%           
  Complexity     2647     2647           
=========================================
  Files           440      440           
  Lines          8013     8013           
  Branches       1529     1529           
=========================================
  Hits           6419     6419           
  Misses          775      775           
  Partials        819      819           

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[BraisGabin]

We should check the site map too after this mege. It should improve a bit the SEO if it's correct. I remember that a fix it once but, probably, it was broken too now.

[cortinico]

@arturbosch Seems like the documentation website is not updated 🤔

The deployment to gh-pages works file:

detekt/redirects.json

Line 1 in ba0ede8

{"/groovydsl.html":"https://detekt.github.io/detekt/gradle.html","/kotlindsl.html":"https://detekt.github.io/detekt/gradle.html","/type-and-symbol-solving.html":"https://detekt.github.io/detekt/type-resolution.html"}

But GH is failing to publish the website as the /docs folder is missing:
https://github.com/detekt/detekt/runs/1390077842

You should be able to update this in the settings of the repo (deploying pages from root of gh-pages and not from the docs/ folder).

[cortinico]

@arturbosch Seems like the documentation website is not updated 🤔

Now it works correctly 👌