Update docs and comments to remove macaron (#14491)

modules/public/static.go

@@ -20,7 +20,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 )
 
-// Static implements the macaron static handler for serving assets.
+// Static implements the static handler for serving assets.
 func Static(opts *Options) func(next http.Handler) http.Handler {
 	opts.FileSystem = Assets
 	// we don't need to pass the directory, because the directory var is only