Update newsletter copy

Author: csswizardry

newsletter.md

@@ -6,9 +6,12 @@ meta: "Join the club!"
 permalink: /newsletter/
 ---
 
-I maintain a small and infrequent newsletter in order to share more detailed and
-exclusive content with those who want it the most. Join over 4,000 performance
-enthusiasts who know how to stay in the know.
+I run a small and occasional newsletter—my _secret blog_. It’s where I share
+thoughts and insights that don’t make it onto this site: lessons from
+consulting, client tales, takes on the industry, and other part-formed ideas I’d
+normally only share with pals.
+
+Join over 4,000 others who like being in on the action:
 
 <a href="https://csswizardry.us14.list-manage.com/subscribe?u=95f3f41085f5f957a07ba5efd&id=ba05b5418d" class="btn  btn--full">Sign up</a>