Updated readme.

README.md

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 # `Substrate`
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 <h4><code>Substrate</code> An Open-source Framework for Human Understanding, Meaning, and Progress.</h4>
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-[Introduction Video](#introduction-video-by-network-chuck) •
-[What and Why](#what-and-why) •
-[Philosophy](#philosophy) •
-[Quickstart](#quickstart) •
-[Structure](#structure) •
-[Examples](#examples) •
-[Custom Patterns](#custom-patterns) •
-[Helper Apps](#helper-apps) •
-[Examples](#examples) •
+[About](#about) •
+[How to Add Problems](#how-to-add-problems) •
 [Meta](#meta)
 
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