Fix broken links on developer.wordpress.org/block-editor

[JustinyAhin]

Description

After merging the new table of content of the block editor developer handbook and changing the files/folders structure (#28665), there are some broken links that were not caught during the process.

This issue track these links to fix them.

The list of the broken links can be found here https://docs.google.com/spreadsheets/d/11-AnXMjwjt7k2LGm2uLr-UlTemTxuCg_UUEb6lFsaXM/edit?usp=sharing. Anyone feel free to report if you spot one.

[JustinyAhin]

Cc @paaljoachim

[priethor]

I've added a couple of broken links I spotted to the doc. As the spreadsheet was empty, I took the freedom of adding some columns; please change them at your preference 🙂

[matmccabe]

I have also added a section on links which dont appear redirect. Please let me know if I was using them incorrectly, the feedback is much appreciated!

[skorasaurus]

Thanks for submitting these. These all appear to be functioning as intended. Please reopen if there are additional broken links or I misunderstood the issue.