Implement basic application config
Created by: WesleyKlop
Fixes #3 (closed)
Implements the following settings:
- Welcome message - seen by voters before starting
- Admin welcome message - seen on admin dashboard
- Legal accepted message - seen by voters and must be accepted before being allowed to start
- Logo url - Will replace the "Vote System" with a custom image from the given url
- Primary color - On supported browsers, changes the primary color into the given one
- Accent color - Same as primary but for accent color Example using nucleus logo and colors