chore: update readme

README.md

@@ -55,15 +55,15 @@ See `./bifrost-gateway --help` and [`./docs/environment-variables.md`](./docs/en
 
 Official Docker images are provided at [hub.docker.com/r/ipfs/bifrost-gateway](https://hub.docker.com/r/ipfs/bifrost-gateway/tags).
 
-- Releases
+- 🟢 Releases
   - `latest` and `release` always point at the latest release
   - `vN.N.N` point at a specific [release tag](https://github.com/ipfs/bifrost-gateway/releases)
-- Developer builds
+- 🟠 Developer builds
   - `main-latest` always points at the `HEAD` of the `main` branch
   - `main-YYYY-DD-MM-GITSHA` points at a specific commit from the `main` branch
-- Experimental, unstable builds
+- ⚠️ Experimental, unstable builds
   - `staging-latest` always points at the `HEAD` of the `staging` branch
-  - `staging-YYYY-DD-MM-GITSHA` points at a specific commit from the `main` branch
+  - `staging-YYYY-DD-MM-GITSHA` points at a specific commit from the `staging` branch
   - This tag is used by developers for internal testing, not intended for end users
 
 When using Docker, make sure to pass necessary config via `-e`: