* Add ability to configure site alts w/ env vars
Site alternatives (i.e. twitter.com -> nitter.net) can now be configured
using environment variables:
WHOOGLE_ALT_TW='nitter.net' # twitter alt
WHOOGLE_ALT_YT='invidio.us' # youtube alt
WHOOGLE_ALT_IG='bibliogram.art/u' # instagram alt
Updated testing to confirm results have been modified.
* Add site alt vars to docker settings and readme