feat(cache folder): Change cache path to ~/.cache/babeldoc

[xxnuo]

No description provided.

[awwaawwa]

The current version shares cache with pdf2zh, so this path cannot be changed.

The cache of pdf2zh and babeldoc are both written by me, and the database definitions are consistent, so they can be shared directly.

Thank you for your contribution!

[awwaawwa]

I have created a issue to track this issue. This issue is expected to be fixed after pdf2zh 2.0 is released.

pdf2zh 2.0 is being tracked at Byaidu/PDFMathTranslate#586 and https://github.com/Byaidu/PDFMathTranslate/milestone/2.

[awwaawwa]

After thinking about it, it seems there won't be much impact if we move it now. Let's just move it.

[awwaawwa]

Thank you for your contribution. According to https://github.com/funstory-ai/BabelDOC/blob/main/docs/CONTRIBUTOR_REWARD.md , you can apply for a monthly membership redemption code for Immersive Translate.