Update requirement files with new feature templates and fix backend API error message, along with mobile project config updates and documentation improvements

03_source/mobile/dev.sh

@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 
 while true; do
-  yarn -D
+  npm i -D
 
-  yarn run dev
+  npm run dev
 
   echo "restarting..."
   sleep 1