Update index.html
template/data: use full URLs for images (can use external)
data: add more missing data
script: enable more data classes
template: add warning alert on top, includes TODO.md
template: add <title>
template: make each menu a .form-group, wrap in .form-horizontal
template: wrap items in div.exhibit (for styling), disable lorem ipsum
#TODO
#README
#TODO
Merge branch 'refs/heads/tulfu' into gh-pages

* refs/heads/tulfu:
  Update index.html
data: apply patch from @tulfu to data.json
(from: <https://github.com/bauhaus/jugend-forscht/pull/2>)

(html is generated, so data has to be changed in json file)