Load content from db

[pavelskipenes]

Rewrite activities, practices, board and FAQ to load content from a table in db called 'content'.
Available columns: id, page={activities,board,FAQ}, title, description, image_filename, image_label, order={uniqe}

This will allow to remove content from source code in activities.php, faq.php and from board.php. Layout will obviously be the same everywhere.