docs: document attempt to keep only tomlkit

[andreoliwa]

Proposed changes

Nothing really changed in this pull request.
I'm documenting the failed attempt.

1. https://github.com/sdispater/tomlkit preserves comments in the TOML file.
2. uiri/toml looks abandoned: Please add a co-maintainer uiri/toml#361
3. I also briefly tried using https://github.com/hukkin/tomli; but it's read only, it doesn't write TOML. I would still need to use tomlkit or uiri/toml to write the file.
4. I couldn't easily remove empty tables from the output of tomlkit.dumps(). I raised the issue on The dumps() function renders empty tables when a dict is the data argument python-poetry/tomlkit#166

[github-actions]

🎉 This PR is included in version 0.32.0 🎉

The release is available on:

• v0.32.0
• GitHub release

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