add termux example to docs (see #147 and #149)

docs/examples/_index.md

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+# Examples
+This section contains some examples how μLauncher can be tweaked.

docs/examples/termux/index.md

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++++
+  title = 'Integration with Termux'
++++
+
+# Termux
+
+μLauncher has no special support for [Termux](https://termux.dev/).
+However it is possible to run Termux commands from μLauncher by using [Termux:Widget](https://wiki.termux.com/wiki/Termux:Widget) to create a pinned shortcut and bind that to a gesture.
+
+* Install Termux:Widget.
+* Make sure that μLauncher is set as the default home screen.[^1]
+* Put the script you want to run into `~/.shortcuts/`.
+* Run `am start com.termux.widget/com.termux.widget.TermuxCreateShortcutActivity`. This will create a pinned shortcut which is treated like an app by μLauncher, i.e. open μLauncher's activity to create a shortcut.
+
+<img src="./screenshot1.png"
+     alt="screenshot"
+     width="200" height="400">
+<img src="./screenshot2.png"
+     alt="screenshot"
+     width="200" height="400">
+
+
+[^1]: Only the default home screen can access shortcuts.