Add blueprints for Adminer, Affine Pro, and AllTube with Docker Compose and metadata

- Added Adminer entry in meta.json with detailed description, logo, and relevant links.
- Introduced Docker Compose configurations for Adminer, Affine Pro, and AllTube services.
- Created template.toml files for each service with default variables for configuration.

blueprints/adminer/template.toml

@@ -0,0 +1,8 @@
+[variables]
+main_domain = "${domain}"
+
+[config]
+[[config.domains]]
+serviceName = "adminer"
+port = 8080
+host = "${main_domain}"