[openstreetmap/openstreetmap-website] Facelift `offline.html` and use Bootstrap classes for "notifications" under the search bar (PR #3907)

[Dimitar]

> Also, a request from [CONTRIBUTING.md](https://github.com/openstreetmap/openstreetmap-website/blob/master/CONTRIBUTING.md) to consider please:
> 
> > Avoid including "fixup" commits. If you have added a fixup commit (for example to fix a rubocop warning, or because you changed your own new code) please combine the fixup commit into the commit that introduced the problem. git rebase -i is very useful for this.

I had Git on my PC but it broke after I reinstalled the OS.. I've managed to squash all changes into a single commit on another branch using Github Desktop (and as a side "bonus" I made a mess in this one). Are you able to somehow clean it up? If not, I can close this PR and open a new one.

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