Styles and images

Description

It is needed that each school has its branding defined through SCSS file, images (logo, splashscreen, icon etc.).

Explanation

One of the base requirements.

Mockups/Screenshots

Not available.

Dependencies, issues to be resolved beforehand

Basic feature should available (#1 (closed), #3 (closed), #6 (closed), #8 (closed), #10 (closed), #12 (closed), #13 (closed))