docs: add mkdocs, update links, add architecture documentation

docs/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3.8'
+
+services:
+  docs:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: goplt-docs
+    ports:
+      - "8000:8000"
+    volumes:
+      # Mount current directory for live reload during development
+      - .:/docs:ro
+    environment:
+      - MKDOCS_WATCH_MEDIA=true
+    command: mkdocs serve --dev-addr=0.0.0.0:8000
+    restart: unless-stopped
+