[Enhancement] style guide

[dschier-wtd]

Description

As a product owner, I want to establish a proper styling of websites and social media, but also products made by us.

Criteria

• style guide provided
• logo and banner included
• colors defined
• at least one short slogan defined
• at least one introduction defined

[dschier-wtd]

the initial guide is there, but needs more work. the colors are off, too.