nixvim: move plugin configuration

modules2/nixvim/completion/snippets/lua.lua

@@ -0,0 +1,13 @@
+return {
+  s(
+    "req",
+    fmt([[local {} = require "{}"]], {
+      f(function(import_name)
+        local parts = vim.split(import_name[1][1], ".", true)
+
+        return parts[#parts] or ""
+      end, { 1 }),
+      i(1),
+    })
+  )
+}