Docs/panel refactor (#43569)

* new refactored panel docs

* fixed links

* removed xtra sharing link, added links to panel display option tasks

* fixed typo

* add aliases

* incorporate PM feedback

* intermediate commit to resolve merge conflict

* final changes to resolve merge conflicts

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

@@ -0,0 +1,20 @@
++++
+title = "Edit a value mapping"
+weight = 60
+aliases = ["/docs/sources/panels/format-data/edit-value-mapping/"]
++++
+
+# Edit a value mapping
+
+You can change a value mapping at any time.
+
+## Before you begin
+
+- [Add a panel to a dashboard]({{< relref "../working-with-panels/add-panel.md" >}}).
+- Ensure you have an existing value mapping to edit.
+
+**To edit a value mapping**:
+
+1. Edit the panel that contains the value mapping you want to edit.
+1. In the panel display options, in the **Value mappings** section, click **Edit value mappings**.
+1. Make the changes and click **Update**.