Since "create" and "produce" do not seem to convey the meaning of
contribution to free software, we use "contribute to", as per @agnez's
suggestion.

https://talk.libreho.st/t/value-produce-free-software/121/13?u=how

Replace links with span in .block. Add respective CSS.

See merge request !3

Fix header alignment

See merge request !2

Fix mobile responsiveness of header

See merge request librehosters/libreho.st!1

This makes the header, and especially the values block, more responsive
for mobile/tablet resolutions.

It also tidies up the html template. There was a mix of spaces and tabs,
and 2/4 space indentation.