Documentation for recently-added features and other

[cspotcode]

Add website documentation for new features and changes

• --show-config
  • added to "Configuration" page in docs branch
• --cwd, --projectSearchDir, --script-mode, etc (may already be done)
  • added to "Configuration" page in docs branch
• implicit @tsconfig/node* and re-exported ts-node/node*/tsconfig.json configs\
• --transpiler ts-node/transpilers/swc-experimental
  • Mention @swc/helpers requirement
• Extract Follow-up on question to @ava/typescript maintainers #1234 (comment) into a section of the third-party tools page
  • Covered by Recipes > AVA page
• update issue templates and links to point to documentation website instead of README
• Move footer links into header
  • "Discuss" link
  • "Release Notes" link
  • Mimic the "Help" page from swc: https://swc.rs/help
  • Added a "Chat"->Discord link
• Add "Star" button to homepage https://buttons.github.io/
• Move all header links to the left? To the right like SWC?
• worker_thread and child_process recipe
  • Update "Other" page title?
  • Add "Advanced" page about worker_threads?
• configure categories not to collapse
  • https://docusaurus.io/docs/sidebar