Tiny documentation issue. I almost feel bad about reporting this.

Describe the bug
Commit 0b79585 removed the Markdown needed to make the links clickable on the GitHub Pages version of Markdown files and the page is slightly harder to navigate.

When viewing the page here, the links are not "autolinked":
https://jakartaee.github.io/mail-api/CONTRIBUTING

But when viewing the page here, the links are "autolinked":
https://github.com/jakartaee/mail-api/blob/master/CONTRIBUTING.md

To Reproduce
Steps to reproduce the behavior:

1. Go to https://jakartaee.github.io/mail-api/CONTRIBUTING
2. Links to URLs, such as https://projects.eclipse.org/projects/ee4j.mail are no longer converted to hyperlink tags ().
3. Compare to https://web.archive.org/web/20201129013940/https://eclipse-ee4j.github.io/mail/CONTRIBUTING.html where the URLs were links.

Expected behavior
Developer resource URLs to be easily navigated to.

Additional context
The discrepancy comes the jekyll-build-pages action to deploy the site to GitHub pages doesn't autolink. It doesn't look like that is an option either. If that, or some other deploy tool, does autolink URLs, that would be easiest to fix this small issue. Otherwise, just putting in the full syntax would work in both cases.