Add Bytestash blueprint with Docker Compose and configuration files

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

blueprints/bytestash/template.toml

@@ -0,0 +1,11 @@
+[variables]
+jwt_secret = "${password:32}"
+
+[config]
+[[config.domains]]
+serviceName = "bytestash"
+port = 5000
+host = "${domain}"
+
+[config.env]
+JWT_SECRET = "${jwt_secret}"