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/whatcd-resolver.cabal

@@ -35,6 +35,10 @@ common common-options
     -- does not export record fields as functions, use OverloadedRecordDot to access instead
     NoFieldSelectors
 
+    -- Allow the same record field name to be declared twice per module.
+    -- This works, because we use `OverloadedRecordDot` everywhere (enforced by `NoFieldSelectors`).
+    DuplicateRecordFields
+
     -- Record punning
     RecordWildCards
 
@@ -48,8 +52,10 @@ common common-options
     -- to enable the `type` keyword in import lists (ormolu uses this automatically)
     ExplicitNamespaces
 
-  default-language: GHC2021
+    -- allows defining pattern synonyms, but also the `import Foo (pattern FooPattern)` import syntax
+    PatternSynonyms
 
+  default-language: GHC2021
 
 library
     import: common-options
@@ -58,6 +64,8 @@ library
 
     exposed-modules:
        WhatcdResolver
+       AppT
+       Html
 
     build-depends:
         base >=4.15 && <5,