add shlink & uptime-kuma

uptime-kuma/README.md

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+uptime-kuma
+===========
+
+[uptime-kuma][1] is a self-hosted monitoring tool like "Uptime Robot".
+
+[1]: https://github.com/louislam/uptime-kuma

uptime-kuma/docker-compose.yml

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+version: "3.8"
+services:
+  uptime-kuma:
+    image: louislam/uptime-kuma
+    ports:
+      - "3001:3001"
+    volumes:
+      - ./data:/app/data
+    restart: unless-stopped