All the author info for Pierre (gatsbyjs#3651)

I'm pretty sure I need to update the actual blog post. It's not in master branch on my computer yet, so will just edit it via web

Author: shannonbux

docs/blog/author.yaml

@@ -66,3 +66,7 @@
   bio: Bay Area adoptee. Programmer, econ nerd, startup enthusiast
   avatar: avatars/sam-bhagwat.jpg
   twitter: "@calcsam"
+- id: Pierre Burgy
+  bio: Co-creator of Strapi. Node.js and APIs lover. Coding when not windsurfing.
+  avatar: avatars/pierre-burgy.jpeg
+  twitter: "@pierre_burgy"