exclude auto-generated contents from docs/index.md; closes #3713

[wanseob]

Description of the Change

• Remove auto-generated contents from docs/index.md
• Make docs/index.md keep excluding auto-generated contents
  1. At the pre-processing stage, copy docs/index.md to docs/index.md.tmp
  2. Trap exit signals and recover docs/index.md with docs/index.md.tmp after the script execution
• Add docs/index.md.tmp to the .gitignore list

Benefits

No more frustrating jobs after npm start docs.

Applicable issues

This PR handles #3713

[coveralls]

Coverage increased (+0.03%) to 91.713% when pulling 7af00e2 on wanseob:issue/3713 into 22831c5 on mochajs:master.

[boneskull]

Thanks for the PR. This removes the auto-generated content, but the idea would be that the content is generated as part of the build process. It looks like you're halfway there--just need to ensure the temporary file is processed by the docs.preprocess script(s).

[boneskull]

@wanseob I've resolved the conflicts and rebased this branch onto master.

[wanseob]

Appreciate your feedback and rebasing @boneskull. I added a new commit to remove the tmp file at the post-processing step. But I'm wondering that isn't it enough to exit with code 0 when it executes md-magic --config ./scripts/markdown-magic.config.js --path docs/index.md.tmp to ensure. If not, how can we ensure elevanty processed docs/index.md.tmp?

[JoshuaKGoldberg]

👋 coming back to this @wanseob, are you still interested in working on this PR? As of #5027 there are again maintainers who can review it now. No worries if you no longer have time - but if you do that'd be great!

[JoshuaKGoldberg]

Closing out to keep our queue small. Someone please yell at me if this should be re-opened though. Cheers! 🤎