fix(docker): reduce Docker size + improve security

docker-compose.yaml

@@ -21,8 +21,8 @@ services:
     ports:
       - 3001:3001
     volumes:
-      - backend-dbstore:/home/perplexica/data
-      - ./config.toml:/home/perplexica/config.toml
+      - backend-dbstore:/app/data:rw
+      - ./config.toml:/app/config.toml:rw
     extra_hosts:
       - 'host.docker.internal:host-gateway'
     networks: