emacs: git links to sourcegraph for work repo

This article [1] shows how to use sourcegraph with the package
`git-link'. However, it requires to modify the configuration of the
repository to add a new remote named 'git-link'. This is inconvenient,
and this can be automated.

This change adds a function to automatically generate the remote URL
when the remote origin of a repo is set to twitter.biz.

We also add the configuration for our own gitea instance.

[1] https://sideshowcoder.com/2020/07/02/opening-sourcegraph-from-emacs/

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