Add notes widget docs

docs/docs/user-guide/widgets/notes-widget.mdx

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+import MoreVertRoundedIcon from '@mui/icons-material/MoreVertRounded'
+
+# Notes Widget
+
+The notes widget allows you to write down quick notes on your home screen. It is not enabled by
+default, but you can add it by tapping on the "Edit widgets" button at the bottom of the home screen
+and selecting "Add widget" > "Notes".
+
+## Usage
+
+### Editing
+
+The notes widget consists of a text field that you can use to write down notes. Basic markdown
+syntax is supported:
+<details>
+
+- `**Bold**`
+- `*Italic*`
+- `` `Monospace` ``
+- `# Heading 1`
+- `## Heading 2`
+- `### Heading 3`
+- `#### Heading 4`
+- `##### Heading 5`
+- `###### Heading 6`
+- `--- Horizontal rule`
+- `> Quote`
+- ` ``` Code block ``` `
+- `- List item`
+- `1. Ordered list item`
+- `- [ ] Unchecked task`
+- `- [x] Checked task`
+
+</details>
+
+### Export notes
+
+Notes can be exported as markdown files. To do so, tap the <MoreVertRoundedIcon /> icon in the bottom right corner and select "Save".
+
+### Add notes
+
+A new instance of the notes widget can be added by tapping the <MoreVertRoundedIcon /> in an existing notes widget and selecting "New note".
+
+### Dismiss notes
+
+Notes can be dismissed by tapping the <MoreVertRoundedIcon /> icon in the bottom right corner and
+selecting "Dismiss". If you dismiss a note, the widget will be removed, unless it is the last instance
+of a note widget. In this case the note widget's content will be cleared instead.