Add AdGuard Home blueprint with Docker Compose and metadata

- Introduced AdGuard Home entry in meta.json with detailed description, logo, and relevant links.
- Added Docker Compose configuration for AdGuard Home service.
- Created template.toml for AdGuard Home configuration with default variables.

blueprints/adguardhome/template.toml

@@ -0,0 +1,14 @@
+[variables]
+main_domain = "${domain}"
+
+[config]
+[[config.domains]]
+serviceName = "adguardhome"
+port = 3000
+host = "${main_domain}"
+
+[config.env]
+# No specific environment variables required for basic setup
+
+[[config.mounts]]
+# Mounts are handled in docker-compose.yml through named volumes