fix: always install pandoc in deploy workflow

Pandoc is needed for both the WordPress deploy step (conditional) and
the standalone HTML/PDF build steps (always run).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JohnRDOrazio

.github/workflows/deploy-docs.yml

@@ -68,7 +68,6 @@ jobs:
           echo "changed_docs=$CHANGED_DOCS" >> "$GITHUB_OUTPUT"
 
       - name: Install pandoc
-        if: steps.changes.outputs.changed_docs != ''
         uses: pandoc/actions/setup@v1
 
       - name: Deploy changed documents to WordPress