Flatten repo structure: move crawler/ to root, remove vqa/ and immoweb/

The crawler subdirectory was the only active project. Moving it to the
repo root simplifies paths and removes the unnecessary nesting. The
vqa/ and immoweb/ directories were legacy/unused and have been removed.

Updated .drone.yml, .gitignore, .claude/ docs, and skills to reflect
the new flat structure.

.drone.yml

@@ -21,8 +21,8 @@ steps:
       password:
         from_secret: dockerhub-token
       repo: viktorbarzin/immoweb
-      dockerfile: crawler/frontend/Dockerfile
-      context: crawler/frontend
+      dockerfile: frontend/Dockerfile
+      context: frontend
       auto_tag: true
 
   - name: Update deployment
@@ -55,8 +55,8 @@ steps:
       password:
         from_secret: dockerhub-token
       repo: viktorbarzin/realestatecrawler
-      dockerfile: crawler/Dockerfile
-      context: crawler/
+      dockerfile: Dockerfile
+      context: .
       auto_tag: true
       cache_from: viktorbarzin/realestatecrawler:latest