Update blocks.md
Update blocks.md

Removing links to articles that don't exist anymore.
sendgrid/docs,katieporter/docs,Whatthefoxsays/docs,katieporter/docs,katieporter/docs,Whatthefoxsays/docs,ksigler7/docs,katieporter/docs,katieporter/docs,ksigler7/docs,sendgrid/docs,Whatthefoxsays/docs,sendgrid/docs,ksigler7/docs