Use cabal haddock-project to build documentation.

Author: jonathanknowles

.github/workflows/build.yml

@@ -106,21 +106,16 @@ jobs:
 
       - name: Documentation (Generation)
         run: >
-          cabal haddock
-          --builddir=${{ env.cabal-build-dir }}
-          --enable-documentation
-          --haddock-hyperlink-source
-          --haddock-html-location
-          'https://hackage.haskell.org/package/$pkg-$version/docs'
+          cabal haddock-project
+          --hackage
+          --output=gh-pages
 
       - name: Documentation (Staging)
         if: |
             github.ref == 'refs/heads/main'
             && matrix.os == 'ubuntu-latest'
             && matrix.ghc == '9.12'
         run: >
-          mv ${{ env.cabal-build-dir }}/build/*/*/*/doc/html/* gh-pages
-
           touch gh-pages/.nojekyll
 
       - name: Documentation (Deployment)