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/map-a-special-value.md

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+title = "Map a special value"
+weight = 50
+aliases = ["/docs/sources/panels/format-data/map-a-special-value/"]
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+
+# Map a special value
+
+Map a special value when you want to format uncommon, boolean, or empty values.
+
+## Before you begin
+
+- [Add a panel to a dashboard]({{< relref "../working-with-panels/add-panel.md" >}}).
+
+**To map a special value**:
+
+1. Edit the panel for which you want to map a special value.
+1. In panel display options, locate the **Value mappings** section and click **Add value mappings**.
+1. Click **Add a new mapping** and then select **Special**.
+1. Select the special value for Grafana to match. Options include:
+   - Null
+   - NaN (Not a Number)
+   - Null + NaN
+   - True
+   - False
+   - Empty
+1. (Optional) Enter display text.
+1. (Optional) Set the color.
+1. Click **Update** to save the value mapping.
+
+![Map a value](/static/img/docs/value-mappings/map-special-value-8-0.png)