Remove almost all references to javy-cli

[jeffcharles]

Description of the change

Removing almost all references to the javy-cli NPM package. I'm keeping the README in place so links on npmjs will still resolve.

I've also opened #725 to remove it from the javy NPM package tests.

Why am I making this change?

I don't want to have to deal with any Dependabot PRs for the package given it's deprecated. Also we should stop referring to it in our documentation to avoid any confusion.

Checklist

• I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-core do not require updating CHANGELOG files.
• I've updated the relevant crate versions if necessary. Versioning policy for library crates
• I've updated documentation including crate documentation if necessary.