started work on style

Signed-off-by: Sweil <mail@sweil.de>
polished style
database connection error handling
polished start page

Signed-off-by: Sweil <mail@sweil.de>
most styling and error handling of db-instructions
(todo: style instruction info and output)
finished tablesolver

Signed-off-by: Sweil <mail@sweil.de>