clean: remove CI debugging artifacts and testing features

- Remove test files: test-ghost-profile.md, test-local-deployment.sh, validate-ghost-extraction.sh, AGENTS.md
- Restore .gitlab-ci.yml to original state without debugging changes
- Restore _quarto.yml to original format without ghost profiles
- Remove ghost-iframe.css styling file
- Restore ghost-upload/.gitlab-ci.yml to original state without force-update job
- Simplify Rust code by removing force update functionality and content extraction
- Restore README.md to original state

Keeps core bug fixes: fixed get_slug() and proper Ghost API duplicate checking

.gitlab-ci.yml

@@ -1,15 +1,10 @@
-stages:
-  - build
-  - deploy
-
 build:
   stage: build
   image:
     name: gcr.io/kaniko-project/executor:v1.23.2-debug
     entrypoint: [""]
   script:
-    - >
-      /kaniko/executor
+    - /kaniko/executor
       --context "${CI_PROJECT_DIR}"
       --dockerfile "${CI_PROJECT_DIR}/Dockerfile"
       --destination "${CI_REGISTRY_IMAGE}:${CI_COMMIT_BRANCH}"
@@ -19,15 +14,13 @@ staging:
   stage: deploy
   image: ${CI_REGISTRY_IMAGE}:${CI_COMMIT_BRANCH}
   script:
-    - echo "Building the main website with Quarto..."
+    - echo "Building the project 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
 
-deploy:
+pages:
   stage: deploy
   script:
     - echo "Publishing site..."
@@ -36,35 +29,6 @@ deploy:
   artifacts:
     paths:
       - public
-
-# Branch preview deployment (for testing)
-preview:
-  stage: deploy
-  script:
-    - echo "Deploying branch preview..."
-    - echo "Preview available at preview URL"
-  needs:
-    - job: staging
-      optional: true
-  artifacts:
-    paths:
-      - public
-  environment:
-    name: preview/$CI_COMMIT_REF_SLUG
-    url: https://${CI_PROJECT_PATH_SLUG}-${CI_COMMIT_REF_SLUG}.gitlab.io
-  rules:
-    - if: "$CI_COMMIT_BRANCH != $CI_DEFAULT_BRANCH"
-
-# GitLab Pages deployment (only on main branch)
-pages:
-  stage: deploy
-  script:
-    - echo "Publishing to GitLab Pages..."
-  needs:
-    - deploy
-  artifacts:
-    paths:
-      - public
   rules:
     - if: "$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH"