remove surplus and from performance comma list (#25891)

README.md

@@ -73,7 +73,7 @@ Gatsby is a modern web framework for blazing fast websites.
   to load your data, then develop using Gatsby’s uniform GraphQL interface.
 
 - **Performance Is Baked In.** Ace your performance audits by default. Gatsby automates code
-  splitting, image optimization, inlining critical styles, lazy-loading, and prefetching resources,
+  splitting, image optimization, inlining critical styles, lazy-loading, prefetching resources,
   and more to ensure your site is fast — no manual tuning required.
 
 - **Host at Scale for Pennies.** Gatsby sites don’t require servers so you can host your entire