Redirect contributors to the Haskell Gitlab

Author: Kleidukos

CONTRIBUTING.md

@@ -1,78 +1,3 @@
 # Contributing to Haddock
 
-Thank you for contributing to Haddock! Here is the information you will need in
-order to make your contribution
-
-## Code of Conduct
-
-We need you to read, acknowledge, and abide by our [Code of Conduct][CoC].
-
-## Reporting issues
-
-Please open a ticket if you get an unexpected behaviour from Haddock!  
-You should ideally include a [Short, Self Contained, Correct (Compilable), Example][SSCCE]
-in your ticket, so that the maintainers may easily reproduce your issue.
-
-Here is a list of things you should include in your ticket
-
-* Your GHC version.
-
-* Your platform, OS and distribution if applicable.
-
-* Your cabal version if applicable.
-
-* Include any other info you think might be relevant (sandbox? unusual setup?).
-
-## Hacking
-
-To get started you'll need the latest GHC release installed.
-
-Clone the repository:
-
-```bash
-git clone https://github.com/haskell/haddock.git
-cd haddock
-```
-
-### Git Branches
-
-If your patch consists of glue code and interface changes with GHC, please
-open a Pull Request targeting the `ghc-head` branch.
-
-Otherwise, for improvements to the documentation generator,
-please base your pull request on the current GHC version branch
-(`ghc-9.0` for instance). The PR will be forward-ported to `ghc-head`
-so that documentation built within GHC can benefit from it.
-
-### Building the packages
-
-#### Using `cabal`
-
-Requires cabal `>= 3.4` and GHC `== 9.4`:
-
-You can install the latest build of GHC via ghcup using this command:
-
-```bash
-ghcup install ghc -u "https://gitlab.haskell.org/ghc/ghc/-/jobs/artifacts/master/raw/ghc-x86_64-deb9-linux-integer-simple.tar.xz?job=validate-x86_64-linux-deb9-integer-simple" head
-```
-
-```bash
-cabal v2-build all --enable-tests
-cabal v2-test all
-```
-
-### Updating golden testsuite outputs
-
-If you've changed Haddock's output, you will probably need to accept the new
-output of Haddock's golden test suites (`html-test`, `latex-test`,
-`hoogle-test`, and `hypsrc-test`). This can be done by passing the `--accept`
-argument to these test suites. With a new enough version of `cabal-install`:
-
-```
-cabal v2-test html-test latex-test hoogle-test hypsrc-test \
-  --test-option='--accept'
-```
-
-
-[SSCCE]: http://sscce.org/
-[CoC]: ./CODE_OF_CONDUCT.md
+Please open tickets and contributions at https://gitlab.haskell.org/ghc/ghc.