Build: Add weekly check for broken markdown links

[yannbf]

Issue: N/A

What I did

With this action we should never have issues where users complain about broken links 🎉

As of the time this PR ran, the repository has a total of 6624 links, of which 138 are broken.

For reference, here's the list of broken links we should fix:
https://github.com/storybookjs/storybook/runs/5726975177?check_suite_focus=true

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[nx-cloud]

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✅ Successfully ran 1 target

• nx run-many --target=prepare --all --parallel --max-parallel=15 -- --optimized

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[shilman]

Awesome @yannbf 🙌

[yannbf]

@shilman this should be good to go but there's something odd with DangerJS:

error danger@11.0.2: The engine "node" is incompatible with this module. Expected version ">=14.13.1". Got "12.22.11"
  error Found incompatible module.

Did something change recently?

[Pepijnk12]

@shilman this should be good to go but there's something odd with DangerJS:

error danger@11.0.2: The engine "node" is incompatible with this module. Expected version ">=14.13.1". Got "12.22.11"
  error Found incompatible module.

Did something change recently?

Should be fixed #17826

[yannbf]

@shilman this should be good to go but there's something odd with DangerJS:

error danger@11.0.2: The engine "node" is incompatible with this module. Expected version ">=14.13.1". Got "12.22.11"
  error Found incompatible module.

Did something change recently?

Should be fixed #17826

Thanks a lot @Pepijnk12 ! I'll rerun the steps now