Tidy up broken links (#19142)

* Add links to excluded links

* Apply suggestions from code review

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

* Sneaky space ❌

Co-authored-by: jmarlena <>
Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

Author: jmarlena

lib/excluded-links.js

@@ -8,11 +8,14 @@ module.exports = [
   'https://github.com/settings/profile',
   'https://github.com/github/docs/edit',
   'https://github.com/github/insights-releases/releases/latest',
+  'https://classroom.github.com/videos',
 
   // Oneoff links that link checkers think are broken but are not.
   'https://haveibeenpwned.com/',
   'https://www.ilo.org/dyn/normlex/en/f\\?p=NORMLEXPUB:12100:0::NO::P12100_ILO_CODE:P029',
   'https://www.linkedin.com/company/github',
   'https://www.facebook.com/',
-  'https://ko-fi.com/'
+  'https://ko-fi.com/',
+  'https://en.liberapay.com/',
+  'https://nbviewer.jupyter.org/github/bokeh/bokeh-notebooks/blob/main/tutorial/06%20-%20Linking%20and%20Interactions.ipynb'
 ]