Enh/multi file write

[AddRain1]

Summary

It restructures the template folder to match the created project directory. It also recursively renders each template with the correct format.

Closes #30

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Changes Made

• Added new stack: <stack name>
• Updated existing functionality
• Improved documentation
• Refactored internal code
• Fixed a bug

Briefly summarize the major changes:

• Wrote a generate templates function in fsutil.go
• Modified generate in Express, Firebase, and MongoDB stacks to use helper

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Testing

How was this change tested?

• go test ./... passes locally
• Manual testing done with taco CLI
• CI checks pass

Provide details:

# Example test commands
go test ./...
taco init test-app