Add Collabora Office blueprint with Docker Compose and configuration files

- Introduced Docker Compose setup for Collabora Office service, including environment variables for domain, username, and password.
- Added logo for Collabora Office.
- Created template.toml for Collabora Office with default variables for configuration.
- Updated meta.json to include Collabora Office with detailed description, logo, and relevant links.

blueprints/collabora-office/template.toml

@@ -0,0 +1,15 @@
+[variables]
+DOMAIN = "${domain}"
+USERNAME = "user"
+PASSWORD = "${password:16}"
+
+[config]
+[[config.domains]]
+serviceName = "collabora"
+port = 9980
+host = "${domain}"
+
+[config.env]
+DOMAIN = "${DOMAIN}"
+USERNAME = "${USERNAME}"
+PASSWORD = "${PASSWORD}"