Add other infra subteams to diagram

Author: jieyouxu

README.md

@@ -16,6 +16,9 @@ flowchart TD
   infra(Infrastructure team)---bootstrap(Bootstrap team)
   infra---release(Release team)
   infra---triagebot(Triagebot team)
+  infra---docker(Docker team)
+  infra---bors(Bors team)
+  infra---internal_sites(Internal sites team)
 ```
 
 ## Functions