chore(docker): add YAML document start marker for clarity

feat(docker): mount assets directory in production for static files

Adding the YAML document start marker (`---`) at the beginning of both `docker-compose.dev.yml` and `docker-compose.yml` files improves readability and clarity, indicating the start of a YAML document. The addition of the `./assets:/app/assets` volume in the production `docker-compose.yml` file allows the application to access static files, which is essential for serving assets like images, stylesheets, or scripts in a production environment.

Author: kzndotsh

docker-compose.dev.yml

@@ -1,3 +1,5 @@
+---
+
 # NOTE: This file is used for local development purposes only.
 
 services:

docker-compose.yml

@@ -1,3 +1,5 @@
+---
+
 # NOTE: This file is used for production deployment.
 
 services:
@@ -11,6 +13,7 @@ services:
     volumes:
       - ./config:/app/config:ro
       - ./tux:/app/tux
+      - ./assets:/app/assets
     env_file:
       - .env
-    restart: unless-stopped
+    restart: unless-stopped