Discord link, orphaned links
When the join page was removed in this commit, the main link to discord was deleted. The link was also available in week1/readme.me, however the current version of the web page wk01/readme.md has had the link removed. As a result, there is no obvious link to the discord channel on the website.
As a related note, the file header modifications were not applied to all pages. Notably, the 404.html page headers contain broken links to the removed join and donate pages.