Docs: InfluxDB doc improvements (#32815)

* Create getting-started-influxdb.md

* Update getting-started-prometheus.md

* Update getting-started-sql.md

* data source edits

* single source intro

* Create first-step.md

* Update influxdb.md

* Update getting-started-influxdb.md

* Update influxdb.md

* break up long file

* Update influxdb-templates.md

* more updates

* Update _index.md

* Update _index.md

* Update getting-started-sql.md

* Update _index.md

* edits

* Update docs/sources/datasources/influxdb/_index.md

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

* Delete influxdb.md

* Update getting-started-influxdb.md

* Update influx-flux.md

* Update _index.md

* Update getting-started-influxdb.md

* Update getting-started-influxdb.md

* content

* content changes

* Update _index.md

* link fixes

* Update getting-started-influxdb.md

* Update getting-started-influxdb.md

* Merge branch 'master' into docs-influxdb

* updated port

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

docs/sources/datasources/add-a-data-source.md

@@ -16,7 +16,7 @@ To add a data source:
    
     {{< docs-imagebox img="/img/docs/v75/sidemenu-datasource-7-5.png" max-width="150px" class="docs-image--no-shadow">}}
 
-1. Click on **Data Sources**. The data sources page opens showing a list of previously configured data sources for the Grafana instance.
+1. Click on **Data sources**. The data sources page opens showing a list of previously configured data sources for the Grafana instance.
 
 1. Click **Add data source** to see a list of all supported data sources.
    
@@ -31,6 +31,3 @@ To add a data source:
 1. Click **Select**. The data source configuration page opens.
 
 1. Configure the data source following instructions specific to that data source. See [Data sources]({{< relref "_index.md" >}}) for links to configuration instructions for all supported data sources.
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