remove unused codes, seperate layout detection out as a new api. Add new rag methed 'table' (#55)

api/apps/kb_app.py

@@ -29,7 +29,7 @@ from api.utils.api_utils import get_json_result
 
 @manager.route('/create', methods=['post'])
 @login_required
-@validate_request("name", "description", "permission", "parser_id")
+@validate_request("name")
 def create():
     req = request.json
     req["name"] = req["name"].strip()