Add Commento blueprint with Docker Compose and configuration files

- Introduced Docker Compose setup for Commento service, including environment variables for domain and PostgreSQL configuration.
- Added logo for Commento.
- Created template.toml for Commento with default variables for configuration.

blueprints/commento/docker-compose.yml

@@ -0,0 +1,22 @@
+version: "3"
+
+services:
+  commento:
+    image: registry.gitlab.com/commento/commento:v1.8.0
+    ports:
+      - "8080"
+    environment:
+      - COMMENTO_ORIGIN=${COMMENTO_ORIGIN}
+      - COMMENTO_POSTGRES=${COMMENTO_POSTGRES}
+    depends_on:
+      - postgres
+
+  postgres:
+    image: postgres:11
+    environment:
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+
+volumes:
+  postgres-data: