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-regular-expression.md

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+title = "Map a regular expression"
+weight = 40
+aliases = ["/docs/sources/panels/format-data/map-a-regular-expression/"]
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+
+# Map a regular expression
+
+Map a regular expression when you want to format the text and color of a regular expression value.
+
+## Before you begin
+
+- [Add a panel to a dashboard]({{< relref "../working-with-panels/add-panel.md" >}}).
+
+**To map a regular expression**:
+
+1. Edit the panel for which you want to map a regular expression.
+1. In the panel display options, in the **Value mappings** section, click **Add value mappings**.
+1. Click **Add a new mapping** and then select **Regex**.
+1. Enter the regular expression pattern for Grafana to match.
+1. (Optional) Enter display text.
+1. (Optional) Set the color.
+1. Click **Update** to save the value mapping.