Simplify index.html for new html5lib
Simplify index.html for new html5lib

Newer html5lib (used in html5print in the test_make_website) strip the
empty value, as it is valid html.

f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver