refactor(users/Profpatsch/whatcd-resolver): move AppT & Html out

These functions are just general setup and html helpers, the main file
is getting a bit long otherwise.

Change-Id: I194e9f7f4caa4ce204d510c885dcf5af63d0e76e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11165
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/whatcd-resolver/default.nix

@@ -11,6 +11,8 @@ let
       ./whatcd-resolver.cabal
       ./Main.hs
       ./src/WhatcdResolver.hs
+      ./src/AppT.hs
+      ./src/Html.hs
     ];
 
     libraryHaskellDepends = [