Listing the Simplifying Software Component Updates guide

This add the newly released Simplifying Software Component Updates guide
to the published list of guides.

Signed-off-by: Georg Kunz <[email protected]>

Author: gkunz

docs/index.md

@@ -12,6 +12,7 @@ This is a list of materials (documents, services, and so on) released by the
 * [Source Code Management Platform Configuration Best Practices Guide](https://best.openssf.org/SCM-BestPractices/)
 * [Compiler Options Hardening Guide for C and C++](https://best.openssf.org/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C++)
 * [Correctly Using Regular Expressions for Secure Input Validation](https://best.openssf.org/Correctly-Using-Regular-Expressions)
+* [Simplifying Software Component Updates](https://best.openssf.org/Simplifying-Software-Component-Updates)
 * [The Memory Safety Continuum](https://memorysafety.openssf.org/memory-safety-continuum)
 
 Note: You can also see the larger list of