Update Dockerfile, docker-compose, and package.json; add versioning script and styles for version display

Fix #21

docker-compose.yml

@@ -2,7 +2,6 @@ version: '3.8'
 
 services:
   org-todo-pwa:
-    image: org-todo-pwa
     build: .
     ports:
       - "3044:3044"
@@ -26,5 +25,4 @@ services:
         - "traefik.http.routers.plan.tls=true"
         - "traefik.http.routers.plan.tls.certresolver=myhttpchallenge"
         - "traefik.http.routers.plan.rule=Host(`todo.casablanca.wahlberg.se`)"
-        - "traefik.http.routers.plan.entrypoints=websecure"
-        
+        - "traefik.http.routers.plan.entrypoints=websecure"