docs: remove broken link from CONTRIBUTING.md

[allanbees]

Removes the broken link https://runnable.com/ from CONTRIBUTING.md and all the other links that aren't referenced.

Fixes 54948.

[josephperrott]

LGTM

[JeanMeche]

Can you also remove the other links that aren't referenced ?

[JeanMeche]

Perfect! Can you squash both commits into one, so this change is a single commit. Thank you.

[allanbees]

Perfect! Can you squash both commits into one, so this change is a single commit. Thank you.

I've squashed the commits. Thanks!

[JeanMeche]

Currrently the PR is made of 5 commit. With the git rebase -i HEAD~5 you should be able to drop the merge commit an squash the others.

[allanbees]

Currrently the PR is made of 5 commit. With the git rebase -i HEAD~5 you should be able to drop the merge commit an squash the others.

Done.

[atscott]

This PR was merged into the repository by commit fac8d34.

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