chore: bind-mount postgres/redis data dirs, update docs for pocketveto.org

- docker-compose.yml: replace named volumes with ./postgres/data and ./redis/data bind mounts
- .gitignore: exclude postgres/ and redis/ data directories
- DEPLOYING.md: update clone URL to public PocketVeto repo
- UPDATING.md: fix paths (~/pocketveto), clone URL, webhook IDs

Authored by: Jack Levy

docker-compose.yml

@@ -6,7 +6,7 @@ services:
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-congress}
       POSTGRES_DB: ${POSTGRES_DB:-pocketveto}
     volumes:
-      - postgres_data:/var/lib/postgresql/data
+      - ./postgres/data:/var/lib/postgresql/data
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-congress} -d ${POSTGRES_DB:-pocketveto}"]
       interval: 5s
@@ -18,7 +18,7 @@ services:
   redis:
     image: redis:7-alpine
     volumes:
-      - redis_data:/data
+      - ./redis/data:/data
     healthcheck:
       test: ["CMD", "redis-cli", "ping"]
       interval: 5s
@@ -105,10 +105,6 @@ services:
     networks:
       - app_network
 
-volumes:
-  postgres_data:
-  redis_data:
-
 networks:
   app_network:
     driver: bridge