Add MkDocs configuration and documentation rules for TrackGo

- Created a new `mkdocs.yml` file to define the structure and navigation for technical documentation.
- Updated `doc-updater.md` to clarify the role of the documentation specialist and the split between technical and user documentation.
- Introduced new rules in `documentation.mdc` and `technical-docs.mdc` to guide the creation of documentation, emphasizing the separation of technical and user content.
- Added a `readme.md` in the `docs` directory to provide instructions for using MkDocs with Backstage.

docs/readme.md

@@ -0,0 +1,8 @@
+## Docs
+
+Using backstage with mkdocs.yml
+Preview :
+
+```
+docker run --rm -w /content -v $(pwd):/content -p 8000:8000 -it harbor.eigen.co.id/eigen/techdocs:1.0.1 serve -a 0.0.0.0:8000
+```