Docs: Update links for 7.0 (#24751)

* update menu

* updated alert list

* Update alert-list-panel.md

* Update alert-list-panel.md

* Update bar-gauge-panel.md

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* deleted old panels

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* Updated stat panel

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* Fixed broken links

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* removed beta text

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docs/sources/variables/_index.md

@@ -5,3 +5,12 @@ type = "docs"
 identifier = "variables"
 weight = 500
 +++
+
+# Templates and variables
+
+A variable is a placeholder for a value. You can use variables in metric queries and in panel titles. So when you change
+the value, using the dropdown at the top of the dashboard, your panel's metric queries will change to reflect the new value.
+
+Variables allow you to create more interactive and dynamic dashboards. Instead of hard-coding things like server, application,
+and sensor names in your metric queries, you can use variables in their place. Variables are displayed as dropdown lists at the top of
+the dashboard. These dropdowns make it easy to change the data being displayed in your dashboard.