feat: update authors

style-guides/josh-mercer.md

@@ -7,6 +7,7 @@
 **Role:** Fullstack Developer, Freelancer
 **Location:** Rotterdam, Netherlands (originally from UK)
 **Age:** 29
+**Date of Birth:** March 14, 1996
 **Browser:** Firefox
 
 ## Affiliation

style-guides/mara-solheim.md

@@ -7,6 +7,7 @@
 **Role:** Creative Technologist, Independent Consultant
 **Location:** Oslo, Norway
 **Age:** 27
+**Date of Birth:** September 8, 1998
 **Browser:** Firefox
 
 ## Affiliation