Monorepo setup

[caffeine-addictt]

Docs

• Move https://github.com/python-thread/thread.ngjx.org to docs/
• Update testing CI
• Update linting CI
• Update site links to go to python-thread/thread instead of python-thread/thread.ngjx.org
• Update README

Labels

• Remove Scope: * labels

Repo

• Update CONTRIBUTING
• Update CODESTYLE
• Add root-level package.json to manage both Nextra docs and Thread Core

Post merge

• Port all issues to python-thread/thread
• Update vercel deploying location