Add Quarto profiles for dual-output rendering

- Add ghost profile for iframe-optimized content
- Create ghost-iframe.css with minimal styling
- Update GitLab CI to build both main site and ghost-content versions
- Ghost profile removes navbar, uses minimal theme, article layout

.gitlab-ci.yml

@@ -14,8 +14,10 @@ staging:
   stage: deploy
   image: ${CI_REGISTRY_IMAGE}:${CI_COMMIT_BRANCH}
   script:
-    - echo "Building the project with Quarto..."
+    - echo "Building the main website with Quarto..."
     - quarto render --to html --output-dir public
+    - echo "Building Ghost-optimized version..."
+    - quarto render --profile ghost --to html --output-dir public/ghost-content
   artifacts:
     paths:
       - public