Fix Tar in bunx electrobun init on windows & ignore node

[NullDev]

1. Use the system tar command on windows for bunx electrobun init instead of cygwin, gitbash, or gnuwin32
   • Resolves Tar extract does not work on Windows using Git Bash #149
2. The init script actually uses nodejs and not bun. Outdated node versions cause errors (e.g. optional chaining)
   • No downside with using bun directly, even in the shebang

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