fix(scripts): fix unpack and repack scripts for the new challenge schema

[ValeraS]

Description

All fields aren't in the schema will be deleted during repacking. (for example 'hints').
All fields in unpacked HTML will be added in packed JSON.

Formats for Translations and Files have been added in unpacked HTML.

Pre-Submission Checklist

• Your pull request targets the dev branch.
• Branch starts with either fix/, feature/, or translate/ (e.g. fix/challenge-tests)
• All new and existing tests pass the command npm test.
• Use npm run commit to generate a conventional commit message.
  Learn more here: https://conventionalcommits.org/#why-use-conventional-commits
• The changes were done locally on your machine and NOT GitHub web interface.
  If they were done on the web interface you have ensured that you are creating conventional commit messages.

Checklist:

• Tested changes locally.
• Addressed currently open issue (replace XXXXX with an issue no in next line)

Closes #42

[Flarp]

good

[scissorsneedfoodtoo]

Sorry for the delay in reviewing this, @ValeraS. Also, thank you @Flarp for helping to QA this.

Everything LGTM! Just going to wait for @raisedadead to sign off on this, too.

As I wrote in #106, since you used that as a jumping off point, I'm thinking we can merge that first, then this PR. Just waiting for the go-ahead.

[Flarp]

i only write the most high quality reviews

[scissorsneedfoodtoo]

@ValeraS, sorry for the delay and thank you for your patience. Everything LGTM, too! Thank you for your contribution, and we're looking forward to the next 👍