Fix #340

The initial table width is too high. The table starts to scale down far
too soon, meaning you have to play in a letterbox ratio.

Removed gradient to give counters a more solid look

After adding a card to the main or side, the search text will become
selected to easily start the next search

 * Refactored code out of common/ into servatrice/
 * added smtp client library
 * disable registration when connected
 * validate email address
 * send activation token via email