Update repository URLs

[johananl]

Supersedes #570. Fixes #567.

Opening a new PR as we needed to rebase and I couldn't push to the original branch, likely because the fork no longer exists.

[johananl]

I've tested more or less all the links manually and they seem to work. The only thing I couldn't test is the _replace() function in tasks.py:

https://github.com/metallb/metallb/pull/688/files#diff-dc31105b816206de63c47bf42ec2a4d7R302-R304

If we can test this without crafting a release, let's do it and then merge (can we @rata?). If we can't, let's merge as is and fix any problems which may arise as we encounter them.

[russellb]

lgtm

[johananl]

@rata do you still have any remaining concerns? If not, I'll go ahead and merge.

[rata]

Have you tested locally with hugo-serve just in case? Be aware of: #554, though

[johananl]

Have you tested locally with hugo-serve just in case? Be aware of: #554, though

Yes, I always do on doc changes.

[johananl]

@rata I'd like to add this to v0.9.5 since without this change we aren't updating the raw manifests anyway.

[rata]

Yes, LGTM.