Dropped always outdated contributors file, link to it the graph on readme

CONTRIBUTORS

@@ -1,9 +0,0 @@
-Andrey Nering <nobody@nobody.tld> (@andreynering)
-Kim Carlbäcker <kim.carlbacker@gmail.com> (@bkcsoft)
-LefsFlare <nobody@nobody.tld> (@LefsFlarey)
-Lunny Xiao <xiaolunwen@gmail.com> (@lunny)
-Rachid Zarouali <nobody@nobody.tld> (@xinity)
-Rémy Boulanouar <admin@dblk.org> (@DblK)
-Sandro Santilli <strk@kbt.io> (@strk)
-Thibault Meyer <nobody@nobody.tld> (@0xbaadf00d)
-Thomas Boerger <thomas@webhippie.de> (@tboerger)

README.md

@@ -46,7 +46,7 @@ Fork -> Patch -> Push -> Pull Request
 ## Authors
 
 * [Maintainers](https://github.com/orgs/go-gitea/people)
-* [Contributors](https://github.com/go-gitea/gitea/graphs/contributors)
+* [Contributors](https://github.com/go-gitea/lgtm/graphs/contributors)
 
 ## License