post-rgsoc internships

as discussed in the organization repo. 

@anikalindtner @FloorD @carpodaster @alicetragedy @sareg0 
I've learned to reduce, reduce, reduce text, in blog posts and other writing, and remove anything that isn't actually required for the one main core message. The message "we need you" is still sent, even if no words are used to make it explicit. The core message is "Tell us about your internship or junior positions"