All content development happens in the gh-pages branch.
A preview site is available via GitHub Pages. Unfortunately, the repository name is included in the URL structure. You'll need to access the page at
https://<github-user>.github.io/<repo-name>/academies/
When asking for feedback, make sure to let everyone know that these will not be the official URLs when deployed to the main site.
To test the Jekyll build without the GH pages repo name in the URL, pass an empty baseurl to the Jekyll command-line:
jekyll serve --baseurl ''