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/specify-thresholds/about-thresholds.md

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+title = "About thresholds"
+weight = 10
+aliases = ["/docs/sources/panels/specify-thresholds/about-thresholds/"]
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+
+# About thresholds
+
+Thresholds set the color of either the value text or the background based on conditions that you define.
+
+There are two types of thresholds:
+
+- **Absolute** thresholds are defined based on a number. For example, 80 on a scale of 1 to 150.
+- **Percentage** thresholds are defined relative to minimum or maximum. For example, 80 percent.
+
+You can apply thresholds to most, but not all, visualizations.
+
+## Default thresholds
+
+On visualizations that support it, Grafana sets default threshold values of:
+
+- 80 = red
+- Base = green
+- Mode = Absolute
+
+The **Base** value represents minus infinity. It is generally the “good” color.