I've waited more than a few minutes and they still aren't showing up
Very rarely, but on occasion, Github Pages runs into a problem and doesn't upload the changes. You can check this by going to https://github.com/adafruit/circuitpython-org, going to the Settings tab, if you have access, and scrolling down to the Github Pages section to check for an error.
Submitting a new PR will cause it to repair itself. If you want to submit an empty Pull Request (no changes), you can first create an empty commit with the following command:
git commit --allow-empty -m "Trigger GHPages Rebuild"
You can change the message to be whatever is appropriate. After that, submit a new Pull Request.