Add Changedetection blueprint with Docker Compose and configuration files

- Introduced Docker Compose setup for Changedetection service, including volume configuration.
- Added logo for Changedetection.
- Created template.toml for Changedetection with default variables for configuration.

blueprints/changedetection/docker-compose.yml

@@ -0,0 +1,13 @@
+version: '3.8'
+
+services:
+  changedetection:
+    image: ghcr.io/dgtlmoon/changedetection.io:0.49
+    restart: unless-stopped
+    ports:
+      - 5000
+    volumes:
+      - datastore:/datastore
+
+volumes:
+  datastore: