Add Baikal blueprint with Docker Compose and configuration files

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

blueprints/baikal/template.toml

@@ -0,0 +1,8 @@
+[variables]
+main_domain = "${domain}"
+
+[config]
+[[config.domains]]
+serviceName = "baikal"
+port = 80
+host = "${main_domain}"