Thanks, Jeff and Alex!

* x-ray updates

* remove image link

* Explain hide X-rays and Our data sections [ci skip]

* Maz suggestion [ci skip]

Co-Authored-By: Maz Ameli <maz@metabase.com>

Co-authored-by: Maz Ameli <maz@metabase.com>

* init

* more detail about summarizing

* start of notebook mode docs

* describe how to do joins

* Screenshot updates for Enterprise Sandboxing

* Updated screenshots for segment & metric

* Added section on new auto-run settings

* Added a note about keyboard shortcuts to run part of a query

* wrap up notebook mode docs

* update old screenshots and remove some unused ones

* update Number viz screenshot

* update a bunch of viz screenshots [ci skip]

* more viz screenshot updating [ci skip]

* misc edits to user guide [ci skip]

* update the severely outdated Getting Started guide [ci skip]

* update more screenshots and the x-rays doc [ci skip]

* update Alerts docs and screenshots [ci skip]

* update new SQL doc [ci skip]

* small edit to writing sql doc [ci skip]

* remove unused GSG images [ci skip]

* update crufty admin screenshots [ci skip]

* remove package-lock.json added by mistake [ci skip]

* resolve review feedback [ci skip]

* address kdoh's comments and prettier some pages