Add under-construction notice
Revert "add teaser hero graphic"

This reverts commit c5a73486ccd538d6c15eee3af0194497a849dbfb.
Revert "remove superfluous footer"

This reverts commit 8a42b706af85dca98ee83daab0a804ae07a4fa7c.
Revert "fix header and make it a bit transparent for a lighter feel"

This reverts commit 6380c3222779126d741c69249fe7bfbad83f54ef.