Update readme

README.md

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- Where programmers share ideas and help each other grow
+ The Human Layer of the Stack
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   <a href="https://www.ruby-lang.org/en/">
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 ## 🔑 Key App tech/services
 
 - We use **Puma** for the server
-- We rely heavily on edge caching with **Fastly**
+- We [rely heavily on edge caching](https://dev.to/ben/making-devto-insanely-fast) with **Fastly**
 - We use **Cloudinary** for image manipulation/serving
 - We use **Keen** for event storage
 - We use **Airbrake** for error monitoring
@@ -110,6 +110,7 @@ Current gotchas: potential environment issues with external services need to be
 - We use **CounterCulture** to keep track of association counts (counter caches)
 - We use **Rolify** for role management.
 - We use **Pundit** for authorization.
+- We use Service Workers to proxy traffic
 
 There's more, but that's a decent overview of the key need-to-knows.