Docs: Clean up Explore documentation (#64908)

* Remove the info about custom Prometheus Query Editor as it's not relevant since #60020

* Update basic Explore documentation

* Change graphs and tables to visualizations as Explore supports different types of visualization

* Make clear "Starred" refers to a tab

* Update how to select start/end date for query history

* Remove Prometheus specific section as it's no longer relevant. Prometheus query editor is documented in https://grafana.com/docs/grafana/latest/datasources/prometheus/query-editor/#metrics-browser

* Add informational log level (added in #30942)

* Use more direct language

* Fix a link

* Make headers more consistent

* Minor tweaks

* Update docs/sources/explore/explore-inspector.md

Co-authored-by: Eve Meelan <81647476+Eve832@users.noreply.github.com>

* Do not enumerate bullet points

* Fix incorrect header type

* Update tracing headers

* Link to more info about Mixed data source

* Use "data source" instead of "datasource"

* Fix tracing headers

* Fix more log headers

* Update docs/sources/explore/explore-inspector.md

Co-authored-by: J Stickler <julie.stickler@grafana.com>

---------

Co-authored-by: Eve Meelan <81647476+Eve832@users.noreply.github.com>
Co-authored-by: J Stickler <julie.stickler@grafana.com>

docs/sources/explore/explore-inspector.md

@@ -43,7 +43,7 @@ For multiple queries or for queries multiple nodes, there are additional options
 
 Grafana generates a CSV file in your default browser download location. You can open it in the viewer of your choice.
 
-1. In the **Inspector** tab, raw query results following instructions in (### Inspect raw query results).
+1. In the **Inspector** tab, get raw query results by following the instructions [described in Inspect raw query results](#inspect-raw-query-results).
 1. Refine query settings until you can see the raw data that you want to export.
 1. Click **Download CSV**.