Fix broken url

app/(app)/letters/developer-productivity-boost-testing-tools-and-tips/page.mdx

@@ -42,7 +42,7 @@ Version 5.0 of Express.js finally landed! Here's what's new.
 
 Sampling is one of the most powerful tools you can wield to extract meaning from large datasets. Here's how to do it with SQL.
 
-**[Server Setup Basics (10 mins)](https://becomesovran.com/blog/server-setup-basics.htm)**
+**[Server Setup Basics (10 mins)](https://becomesovran.com/blog/server-setup-basics.html)**
 
 Most web devs can't setup their own servers. This is a guide on setting up a basic server. A skill that is great to have to understand what the tools inside the black box are doing for us.