add note on dead link checking

[mProjectsCode]

Edited

Added

Checklist

• before creating a new note, I searched the vault
• new notes have the .md extension
• (if applicable) attached images have descriptive file names
• (if applicable) for new notes in the folder "04 - Guides, Workflows, & Courses", I added a link to them in one of the "for {group X}" overviews: https://publish.obsidian.md/hub/04+-+Guides%2C+Workflows%2C+%26+Courses/%F0%9F%97%82%EF%B8%8F+04+-+Guides%2C+Workflows%2C+%26+Courses

Luke said I don't need to fill this out.

[lguenth]

Thanks for contributing! And in case anyone looks at this... I'll run the update process locally to check whether it gets overwritten – but I approved putting in the missing plugins manually for now.