[onboarding] More niceties for haxthewebme.sh and haxthewebme.ps1

[winstonwumbo]

New Features

• Switched the Node.js installer from nvm to fnm
  • nvm only works in Unix shells, while fnm is cross-platform with Windows PowerShell
  • Both are official recommendations by Windows
  • fnm being written in Rust = brrrrrrr speed
• New logic to initialize fnm in both .bashrc and Microsoft.PowerShell_profile.ps1, when installed in Git Bash or Cygwin
  • Students and other new contributors won't be confused about Node.js only working in one shell
• Modularized haxthewebme.sh with some more reusable functions, in place of duplicating code blocks
• Improved compatibility with GitHub Desktop in haxthewebme.ps1
  • Lots of students are familiar with GitHub Desktop, but it doesn't provide a CLI to clone with
  • If git isn't installed on Windows, the script stops and asks the user to manually clone with GitHub Desktop
  • On the second run, the script detects an already cloned haxtheweb/webcomponents repo and skips to the next command

[vercel]

@winstonwumbo is attempting to deploy a commit to the HAXTheWeb Team on Vercel.

A member of the Team first needs to authorize it.