Add Confluence blueprint with Docker Compose and configuration files

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

blueprints/confluence/docker-compose.yml

@@ -0,0 +1,18 @@
+version: "3"
+
+services:
+  confluence:
+    image: atlassian/confluence-server:8.6-ubuntu-jdk17
+    ports:
+      - "8090"
+    volumes:
+      - confluence-data:/var/atlassian/application-data/confluence
+    environment:
+      - JVM_MINIMUM_MEMORY=${JVM_MIN_MEM}
+      - JVM_MAXIMUM_MEMORY=${JVM_MAX_MEM}
+      - CATALINA_CONNECTOR_PROXYNAME=${DOMAIN}
+      - CATALINA_CONNECTOR_SCHEME=http
+      - CATALINA_CONNECTOR_SECURE=true
+
+volumes:
+  confluence-data: