Fix Meetup event listings
Fix Meetup event listings

Browsers weren't loading the Meetup section because our Meetup API call
was loading mixed content (ie, non-TLS encrypted content) into a page
served over HTTPS. This change calls the API over HTTPS, thus
eliminating the mixed content.

See here for more information:
  https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content

Fixes #4

Trianglerb/trianglerb.github.io,Trianglerb/trianglerb.github.io,Trianglerb/trianglerb.github.io,Trianglerb/trianglerb.github.io