Update Docusaurus 3 and other npm packages

[afomi]

this branch includes some manual updates to markdown files, where certain TypeScript documentation syntax couldn't be parsed.

I addressed most of these by wrapping code in a ts code block. A dozen or so others, I tried wrapping in code syntax.

It looks like the docs may have been generated using typedoc, and if so, it'd be worthwhile to regenerate the scrypt-ts documentation.

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Update:

I ended up adding typedoc to this branch and can generate the latest scrypt-ts docs using npx typedoc.

There appears to be a change with the BSV library, such that the latest version of scrypt-ts is now using @scrypt-inc/bsv. These files were generated, but I removed them for now.

They can be regenerated easily by running npx typedoc again.

I did notice that the docs showed more README files in the docs, which looked a little odd, which is why I ended up deleting them for now.