[FEATURE] new sites (MINF, MUSK, Info&Hilfe)

[cody0-0]

Short feature description:

Add seperate subpages to give more information about the Studiengänge and general help.

What problem shall it solve?

Help all students to find important stuff and new students to enroll.

Additional context**

Notion: Studiengangsseiten Notion: Infoseite

Notion: Anforderungen

[cody0-0]

Also 404 Page.

[duevil]

• [x] 404 (#56)
• [ ] about minf
• [ ] about musk
• [x] info/help