home: create 'modules/home' folder

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

modules/home/vim/ftdetect/automake.lua

@@ -0,0 +1,6 @@
+-- Use Automake filetype for `local.am` files, explicit `set` to force override
+vim.filetype.add({
+    filename = {
+        ["local.am"] = "automake",
+    },
+})