Updates the docs to work with the website repo - mainly
relative link updates.
Adds a menu.yaml file to build the sidebar menu (no longer
using front matter weight).
* Update defaults.ini and sample.ini with the SAML assertion mapping
fields
* Document Grafana's ability to map ACS attributes while a Grafana user is created
* docs: Link to SAML docs and document configuration options
- Document configuration options `defaults.ini` and `sample.ini`
- Add the SAML documentation
- Link to the SAML documentation from "what's new in 6.3"