Fix broken link to tutorial for building blog (#5273)
Fix broken link to tutorial for building blog (#5273)

I don't know if it's the original article but at least it looks fairly similar
fk/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,fk/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,fk/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,0x80/gatsby