add mkdocs

docs/widgets/info/greeting.md

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+---
+title: Greeting
+description: Greeting Information Widget Configuration
+---
+
+This allows you to display simple text, can be configured like so:
+
+```yaml
+- greeting:
+      text_size: xl
+      text: Greeting Text
+```
+
+Valid text sizes are `4xl`, `3xl`, `2xl`, `xl`, `md`, `sm`, `xs`.