Rasa: readme: `installation` broken link

[tormath1]

Rasa version: N/A

Rasa X version (if used & relevant): N/A

Python version: N/A

Operating system (windows, osx, ...): N/A

Issue: broken link for installation.

- **I'm ready to install Rasa 🚀**
  [Installation](https://rasa.com/docs/rasa/installation/)

It should be: https://rasa.com/docs/rasa/user-guide/installation/

Error (including full traceback):

404

Command or request that led to error:

$ curl -i -s -o /dev/null -w %{http_code} https://rasa.com/docs/rasa/installation/ 

Content of configuration file (config.yml) (if relevant):

Content of domain file (domain.yml) (if relevant):

[amn41]

thanks for spotting this! could you please create a PR to fix the link?

[tormath1]

Sure: https://github.com/RasaHQ/rasa/pull/3930 :wave: