feat: Adds excalidraw.

excalidraw/README.md

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+# Excalidraw
+
+[Excalidraw](https://excalidraw.com) is a drawing / infinite canvas tool.

excalidraw/compose.yml

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+networks:
+  proxy:
+    external: true
+
+services:
+  excalidraw:
+    image: excalidraw/excalidraw:latest
+    container_name: excalidraw
+    ports:
+      - 5005:80
+    labels:
+      com.centurlinklabs.watchtower.enble: true