Add a link to an archived copy of the old SlimDevices bugzilla site.

docs/contributing/reporting-a-bug.md

@@ -28,3 +28,13 @@ If you did not find a previous report of your issue you can submit your report t
 - description of the issue
 - steps to reproduce the bug
 - browser used (if relevant)
+
+# SlimDevices Bugzilla Archive
+
+We have a static copy of the former bugs.slimdevices.com bugzilla site.
+
+https://bugs-archive.lyrion.org
+
+Use it for reference, or archeology. Or just for fun!
+
+Thanks @gregklanderman who took the effort of archiving the site when it was still available.