Docs feedback: Change fog.io links to fog.github.io

• Start this issue's title with Docs: or Docs feedback:.

Problem to solve

The link to fog.io in the documentation on backing up Gitlab is broken. This site has moved to fog.github.io, see:

https://github.com/fog/fog.github.com/commit/e193d4eadbd6d71f952ce337bb21b28508dc27e7

Further details

Proposal

Who can address the issue

Other links/references

Link the doc and describe what is wrong with it.