add endomondo.com to sites.json
javascript: remove generated content from git
javascript: update README
move assets
fix paths in css
remove facebook
remove php dependency
update CONTRIBUTING.md

TODO: merge with README.md
remove fake-identity-generator and favicon dup
add index.html

TODO: dynamically load sites.json
Merge branch 'master' into javascript
cleanup index.html
remove flags
javascript: provide basic functionality

Tooltips dont work, yet. I have to find a more convenient way to add
elements.