Feat/migrate to new package process

[niktek]

What does your PR address?

Updates to package.json to match new process from SK
Added keywords to show up on npmjs.org
Adjusted pre/post build scripts to reflect new package process
Added quick fixes to A11y warnings so that people might be incentivised to actually test the package
Dependencies upgrade - have hard pinned TypeScript to 4.9.5 till it is safe to go to 5.x

Fixes #1163

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Name	Status	Preview	Comments	Updated
skeleton-docs	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 31, 2023 at 7:41PM (UTC)

[endigo9740]

@niktek let's discuss this during the team meeting today!

[endigo9740]

@niktek sorry I haven't been on in the evenings as much to catch you on this, but let me know what's needed here to move this forward. If you set out a set of testing conditions I'll run through that tomorrow. Thanks!

[endigo9740]

@niktek I aimed to run the package command, but was met with an error right at the end.

I'm also seeing a ton of uncommitted files after running package. It seems the contents of /package are no longer part of .gitignore?

[endigo9740]

@niktek Both Dom and myself were able to test this and confirm things appear to be working as expected, so I'm going to go ahead and merge. That said, let's monitor this over the next couple weeks, even through release to ensure all is well with the new updates.