Documentation: Add links to ./docs and the JavaDoc GitHub pages

README.md

@@ -26,9 +26,9 @@ This is a mono-repository containing several software products. Right now, there
 
 Each product has its own `README.md` with more details.
 
-# Architecture Documentation
-
-- Architecture C4 diagrams (in markdown format via [mermaid](https://mermaid.js.org/)) can be found in [`./doc/architecture-diagrams](./doc/architecture-diagrams/)
+# Additional Documentation
+- The [`./doc`](./doc) folder contains additional information e.g. on architecture and domain model
+- Back end JavaDocs can be found [here](https://digitalservicebund.github.io/ris-reports/docs/backend-code-documentation/norms-java.html)
 
 # How to run the VSCode Extension and the Time Machine locally