fix: remove hugo mod installation / initialization

Author: alee

.github/workflows/run-htmltest.yml

@@ -21,6 +21,7 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: "18"
+          cache: 'npm'
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
@@ -35,8 +36,6 @@ jobs:
           HUGO_ENV: "production"
         run: |
           yarn install
-          hugo mod init github.com/openmodelingfoundation/openmodelingfoundation.github.io
-          hugo mod get github.com/google/docsy@${{ steps.hugo-version.outputs.DOCSY_VERSION }}
           hugo --minify -d $GITHUB_WORKSPACE/dist
       - name: run htmltest
         continue-on-error: true