Improve search

[Ryuno-Ki]

First it should try to look for a book and verse and start a fulltext search if that wasn't successful.
In case it was successful, it should redirect to that page.

[Ryuno-Ki]

Placeholder: „Bibelstelle oder Begriff suchen” (maybe make that as label which sits above the input once the user start entering).

[Ryuno-Ki]

Several steps needed here:

1. List all books in an Array (incl. their abbreviations)
2. Build a search.php, which tests the query against this list
   1. If match, return the book and verse
   2. If not match, return a full text search
3. Think about how to hide verses, we don't have content for

Assign to me after you are done with the backend.