Adds index page to sample-scripts. Closes #4640

Author: Jwaegebaert

docs/docs/sample-scripts/introduction.mdx

@@ -0,0 +1,12 @@
+---
+sidebar_position: 0
+title: Introduction
+---
+
+# Sample Scripts
+
+This section contains a collection of sample scripts that automate managing the different services in Microsoft 365.
+
+If you'd like to add your script to the collection, let us know by [submitting an issue](https://github.com/pnp/cli-microsoft365/issues/new?template=sample.md&title=New+sample+script%3A+<short+description>) on GitHub.
+
+You can browse the scripts by workload, using the navigation, or by topics, using the [tags overview page](../tags).