feat: esm

[ThaUnknown]

What is the purpose of this pull request? (put an "X" next to item)

• [x] Documentation update
• [ ] Bug fix
• [x] New feature
• [ ] Other, please explain:

What changes did you make? (Give an overview)

• chore: update docs and package description
• refactor: switch to esm imports and exports

Which issue (if any) does this pull request address?

• https://github.com/webtorrent/webtorrent/issues/2177

Is there anything you'd like reviewers to focus on?

[welcome[bot]]

🎉 Congrats on getting your first pull request landed!

[webtorrent-bot]

:tada: This PR is included in version 10.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: