docs: tutorial summary page (#1253)

docs/pages/tutorials.mdx

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+# MUD tutorials
+
+These tutorials teach you how to do various things with MUD.
+
+## Modifying the getting started example
+
+[These tutorials](tutorials/minimal) teach you how to make various changes to [the getting started example](https://github.com/latticexyz/mud/tree/main/examples/minimal).
+This is an easy way to learn how to modify MUD functionality in various ways.
+
+- [Add a system](tutorials/minimal/add_system):
+  In this tutorial you add a system to decrement the counter and update the application to use it.
+
+## Walkthrough
+
+[These tutorials](tutorials/walkthrough) are deep dives into various sections of code.
+
+- [The onchain components of getting started](tutorials/walkthrough/onchain):
+  In this tutorial you learn how to understand the onchain components of the minimal template.
+
+## Emojimon
+
+[This tutorial](tutorials/emojimon) is a complete game, explaining how to create the data model, systems to manipulate it onchain, and then user interface.