Broken links

[sebastiaanspeck]

In tldr-maintenance we have a "live" issue which gets updated every day. This issue lists all links that have problems. Right now the list only contains three unaddressed issues:

1. 9 404's for keith.github.io, most of them since the command does not exist anymore in the latest macOS version
2. 1 404 for learn.microsoft.com
3. A timeout for magento.com, since it has been migrated to the Adobe suite

In this issue I want to discuss with others how we would like to resolve these issues. IMO just removing the link, or even the page, is our last resort.