v0.1 hotfixes (not to be merged into master)

Closed username-removed-25042 requested to merge pserwylo/fdroid-website:v0.1-hotfixes into master

NOTE: This is currently targeting master, but that is because I don't know what naming scheme @eighthave wants for release branches like this. Please don't merge this into master. It will conflict anyway.

Adds search widget to sidebar, and git tag/hash to footer.