fix: replaces several 404 with new links

[maehr]

Add / Remove / Edit {entry name} to/from the "{section name}" section.

Short pitch

Describe why this change is made. Alternatively, refer to existing issues if
any. You could try to answer:

• Why do / don't you find this tool awesome?
• How do you use this tool in your workflow?
• What advantages / disadvantages does it have compared to {another tool}?

Checklist

• I have read and understood the contribution guidelines.
• If the entry is a software:
  • it should be maintained (at least a commit / a release in the past 3 years),
  • it is open-source with appropriate license
• Table of contents has been updated (if a section is added / removed).
• Contents have been sorted alphabetically.

[ashwinvis]

Thanks @maehr!