Update runtime files

runtime/ftplugin/heex.vim

@@ -0,0 +1,16 @@
+" Elixir filetype plugin
+" Language: HEEx
+" Maintainer:	Mitchell Hanberg <vimNOSPAM@mitchellhanberg.com>
+" Last Change: 2022 Sep 21
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal shiftwidth=2 softtabstop=2 expandtab
+
+setlocal comments=:<%!--
+setlocal commentstring=<%!--\ %s\ --%>
+
+let b:undo_ftplugin = 'set sw< sts< et< com< cms<'