Docs: Add and organize panels (#51763) (#51764)

* combines topics into add and organize panels topic

* updates front matter

* fixes relrefs

* fixes typo

* Update docs/sources/dashboards/add-organize-panels.md

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* Update docs/sources/dashboards/add-organize-panels.md

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* make prettier

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>
(cherry picked from commit e4bf7ddefe)

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

docs/sources/panels/format-data/edit-value-mapping.md

@@ -12,7 +12,6 @@ You can change a value mapping at any time.
 
 ## Before you begin
 
-- [Add a panel to a dashboard]({{< relref "../working-with-panels/add-panel/" >}}).
 - Ensure you have an existing value mapping to edit.
 
 **To edit a value mapping**: