Remove grench.kak

Closes #571

rc/extra/grench.kak

@@ -1,17 +0,0 @@
-# http://leiningen.org/grench.html
-# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
-
-def grench -docstring 'eval selection with Grench/Leiningen' %{ %sh{
-
-  if ! grench eval ''; then
-    echo "echo 'auto launching headless Leiningen REPL'"
-    ( lein repl :headless ) > /dev/null 2>&1 < /dev/null &
-    while ! grench eval '' > /dev/null 2>&1; do continue; done
-  fi
-  }
-  info -anchor "%val(cursor_line).%val(cursor_column)" %sh{ grench eval "$kak_selection" }
-}
-
-hook global WinSetOption filetype=clojure %{
-  map buffer normal <ret> :grench<ret>
-}