Small bug fixes and clean up of dead code.

General goal of this was to clean up things that are unused/unloved, and reduce the dependencies down to the things that we need and that matter.
The end goal being that long term maintenance is easier.

Fixes:

• Export simpleCollapsify correctly from the entrypoint.

Updates:

• Updated to TS 5
• Updated xo for recent ESLint changes.

Removals:

• Removed the http server mode, it was not loved.
• Removed the coverage testing, it was never used.
• Removed got from the cli version, used global fetch instead. (hard dep on nodejs >= 18)
• Makefile/Travis config, these were unused.