Update README to remove graph generation note

Removed mention of graphs generated by git-sim in the README.

Author: initialcommit-io

README.md

@@ -5,8 +5,6 @@
 
 **The visual layer for Git in your own repos:** simulate, record, replay, audit, and share individual Git commands or entire Git workflows, wherever you or your agents run them.
 
-All graphs that appear in this readme were generated by git-sim. Click any graph to open it in the [git-sim web viewer](https://initialcommit.com/tools/git-sim/viewer).
-
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