Moved and renamed Docker files

The name of the Docker Compose file now matches more closely with
the ones in the Docker docs, e.g. `compose.yaml` in https://docs.docker.com/compose/gettingstarted/#step-2-define-services-in-a-compose-file
and `compose.<something>.yaml` in https://docs.docker.com/compose/how-tos/multiple-compose-files/merge/
Chose a `.dev` suffix for it, to make it clearer that it's only used for
development stuff (not production).

Author: ddabble

Dockerfile renamed to docker/Dockerfile

@@ -2,13 +2,13 @@ version: '3'
 
 services:
   web:
-    build: .
+    build: ..
     command: >
       bash -c "uv run manage.py migrate
       && uv run manage.py runserver 0.0.0.0:8000"
     volumes:
-      - ./:/web
+      - ../:/web
     ports:
       - "8000:8000"
     env_file:
-      - .env
+      - ../.env