feat: implement Ancestor quote bot with Docker support

docker-compose.yml

@@ -0,0 +1,9 @@
+services:
+  ancestor-bot:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    environment:
+      - MATRIX_HOME_SERVER=${MATRIX_HOME_SERVER:-https://matrix.org}
+      - MATRIX_ACCESS_TOKEN=${MATRIX_ACCESS_TOKEN:?required}
+      - BOT_COMMAND=${BOT_COMMAND:-!quote}