Update config.js
Update config.js

The demo should have a maximum of 6 icons.

Co-Authored-By: Alexander Shelepenok <6723e79255f41ba291ee9dd9ab7ea2713c488d10@gmail.com>
wpioneer/gatsby-starter-lumen,ochaloup/blog.chalda.cz,alxshelepenok/gatsby-starter-lumen,hb-gatsby/gatsby-starter-lumen,nicklanasa/nicklanasa.github.io,alxshelepenok/gatsby-starter-lumen,nicklanasa/nicklanasa.github.io,ochaloup/blog.chalda.cz,renegens/blog,renegens/blog