README: Update and clean up

Various things have changed in the meantime.
Instead of duplicating things just point to the documentation website
where possibe.

README.md

-# DBP API Server Template
+# DBP Relay API Server Template
 
 [GitLab](https://gitlab.tugraz.at/dbp/relay/dbp-relay-server-template)
 
@@ -6,34 +6,14 @@ This repository can be used as a template/starting point for your own API instan
 It consists of a minimally configures Symfony application and development environment
 and includes/integrates:
 
-* The [dbp/api-core-bundle](https://gitlab.tugraz.at/dbp/dbp-api/api-core-bundle): Which provides authentication, some same base end points and entities and configuration for [api-platform](https://api-platform.com/)
+* The [dbp/relay-core-bundle](https://gitlab.tugraz.at/dbp/relay/dbp-relay-core-bundle): Which provides the base functionality and ties everything together
+* The [dbp/relay-auth-bundle](https://gitlab.tugraz.at/dbp/relay/dbp-relay-auth-bundle): Which provides authentication via OIDC
 * A docker-compose based development environment
 * Linter/Unittest integration
 
-## Documentation
+## Creating your own API Instance using this Template
 
-The documentation is work in progress and currently exists in another repository which can be viewed here:
-[Relay API Gateway](https://dbp-demo.tugraz.at/dev-guide/relay/)
-
-It will be moved into this repository in the near future.
-
-## Creating your own API instance and creating your own Bundle
-
-* Fork this repository
-* Run the docker-compose based development environment and test it
-* Copy the "api-starter-bundle" repo and rename everything
-* Add the new bundle to your API fork
-
-## Installation
-
-```bash
-# install relay-server-template to path "relay-api" (you need php and composer for this)
-composer create-project dbp/relay-server-template relay-api "dev-main"
-cd relay-api
-
-# install dependencies
-composer install
-```
+See https://dbp-demo.tugraz.at/dev-guide/relay/getting_started/
 
 ## Development