~rbn/neinp

add build badge
add go vet and golint to build
fix link to rssfs
only mail on build failure
add contact to readme
use custom go.rbn.im import path
update go.mod
fix url in path, now point to sr.ht url
fix git url in .build.yml
use archlinux in .build.yml
move to sr.ht and go modulize