home: create 'modules/home' folder

Consolidating all modules under the same path, to clear out the
top-level directory.

modules/home/vim/after/ftplugin/gitcommit.vim

@@ -0,0 +1,10 @@
+" Create the `b:undo_ftplugin` variable if it doesn't exist
+call ftplugined#check_undo_ft()
+
+" Enable spell checking on commit messages
+setlocal spell
+let b:undo_ftplugin.='|setlocal spell<'
+
+" Change max length of a line to 72 for this buffer
+setlocal colorcolumn=72
+let b:undo_ftplugin.='|setlocal colorcolumn<'