Avoid confusion caused by collapsing navbar.

On smaller screens, the navbar collapses to a single button.  This
collapsing includes the search field, which (understandably) confuses
users.

Remove both "Home" and "About" button and move search field to
non-collapsing part of the navbar.

Fixes #6945.
Added instructions for how to run a local Atlas server
strip whitespaces in search
Don't pretend to be busy forever if a relay doesn't exist.

Fixes #5832.
Don't break if last_restarted field is missing.

The last_restarted field in details documents was changed from required to
optional in March 2012.  The reason is that Onionoo might be missing a
server descriptor and cannot learn the relay/bridge restart time without
it.  Make sure we don't rely on the field being present.

Fixes #5307.
Merge branch 'task-7861'
Don't expect optional fields in details documents.

Fixes #7885 and proactively fixes similar bugs which just didn't show up
yet.