[IMP] website: make website.redirect fields required

Before this commit, it was possible to create redirect with empty values.
Now, for new db, that will be required.

Fix usability according to first feedback
   - Redirect / menu should be visible without debug mode
     because user need it when they start their website and
     dont know at the beginning how to enable it (fgi)
   - fa icon in page manager was for blind people
   - missing widget on sequence field