Added sidebar copyright notice (configurable)

Signed-off-by: JWhy <jwhy@jwhy.de>
Put bottom margin to header CSS

Signed-off-by: JWhy <jwhy@jwhy.de>
Implement static page router

Signed-off-by: JWhy <jwhy@jwhy.de>
Improve sidebar CSS, replace sidebar copyright URL

Signed-off-by: JWhy <jwhy@jwhy.de>
Add line return after tracking code insertion in template

Signed-off-by: JWhy <jwhy@jwhy.de>
Show message if there are no known grades, format grades controller

Signed-off-by: JWhy <jwhy@jwhy.de>