enhance.dev rework

[shaedrich]

Todo:

• / currently redirects to /wtfs. That's not the current behavior
• /wtfs works but /wtfs doesn't. That's not the current behavior
• about and license page

Open questions

• jQuery still needed? I can't find any place, where it is used
• Should the design stay the same or be brought up to date?
• Should shared/ logic be preserved?