Doc: Organized the Getting Started section (#39813) (#40102)

* First commit with reorganized and updated content.

* Updated Getting started topic.

* Changed some wording.

* Removed extra word "setting".

* Update docs/sources/getting-started/getting-started-prometheus.md

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>

* Update docs/sources/getting-started/getting-started-prometheus.md

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>

* Updated doc based on review.

* Fix linting errors

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>
Co-authored-by: Piotr Jamróz <pm.jamroz@gmail.com>

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>
Co-authored-by: Piotr Jamróz <pm.jamroz@gmail.com>

docs/sources/getting-started/getting-started-sql.md

@@ -1,8 +1,8 @@
 +++
-title = "With Grafana and MS SQL Server"
 description = "Guide for getting started with Grafana and MS SQL Server"
 keywords = ["grafana", "intro", "guide", "started", "SQL", "MSSQL"]
 aliases = ["/docs/grafana/latest/guides/gettingstarted","/docs/grafana/latest/guides/getting_started"]
+draft = true
 weight = 400
 +++