add Dockerfile + docker-compose for Dokploy Git deployment

Dockerfile

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+FROM nginx:alpine
+COPY index.html /usr/share/nginx/html/index.html

docker-compose.yml

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+# Dashboard — home.manohargupta.com
+# Served by nginx:alpine, built from repo by Dokploy.
+# Auto-deploys on push to Forgejo via Dokploy Git integration.
+
+services:
+  dashboard:
+    build: .
+    restart: unless-stopped
+    networks:
+      - dokploy-network
+    labels:
+      - "traefik.enable=true"
+      - "traefik.docker.network=dokploy-network"
+      - "traefik.http.routers.dashboard.rule=Host(`home.manohargupta.com`)"
+      - "traefik.http.routers.dashboard.entrypoints=websecure"
+      - "traefik.http.routers.dashboard.tls.certresolver=letsencrypt"
+      - "traefik.http.services.dashboard.loadbalancer.server.port=80"
+    deploy:
+      labels:
+        - "traefik.enable=true"
+        - "traefik.docker.network=dokploy-network"
+        - "traefik.http.routers.dashboard.rule=Host(`home.manohargupta.com`)"
+        - "traefik.http.routers.dashboard.entrypoints=websecure"
+        - "traefik.http.routers.dashboard.tls.certresolver=letsencrypt"
+        - "traefik.http.services.dashboard.loadbalancer.server.port=80"
+
+networks:
+  dokploy-network:
+    external: true