feat: remove appwrite and add nextjs backend

backend/docker-compose.yml

@@ -0,0 +1,15 @@
+version: '3.8'
+services:
+  db:
+    image: postgres:14.1-alpine
+    restart: always
+    environment:
+      - POSTGRES_USER=${DB_USER}
+      - POSTGRES_PASSWORD=${DB_PASSWORD}
+      - POSTGRES_DB=pingvin-share
+    ports:
+      - '5432:5432'
+    volumes:
+      - pingvin-share-dev-db:/var/lib/postgresql/data
+volumes:
+  pingvin-share-dev-db: