Adapting the changes of Component Revision to docs/README.md and adding section for Templating

[dsstrassner]

Hi @acgruber, in today's CSS-Squad we talked about linking the templating/scss readme.mds in the docs/README.md, and therefore other interested persons could easily find this part of the documentation.

Within this task, I realized, that some other parts of the readme.md are outdated or the links have changed. I tried to adapt the file accordingly

Best Regards

@dsstrassner