home: vim: use actual lua files

Since most of the settings are actually just lua in a VimL file.

home/vim/plugin/abbreviations.lua

@@ -0,0 +1,9 @@
+local abbreviations = {
+    -- A few things that are hard to write in ASCII
+    ["(R)"] = "©",
+    ["(TM)"] = "™",
+}
+
+for text, result in pairs(abbreviations) do
+    vim.cmd.abbreviate(text, result)
+end