fix: 🐛 ensure os-agnosticism for windows compatibility

[SpriteDay]

Why?

The Fleek CLI currently fails in Windows environments because it utilizes shell commands (rm -rf, cp) and path construction logic that are not cross-platform. This prevents Windows users from building and running the CLI, leading to errors like the en.json not found error reported in issue #47

How?

This PR addresses the compatibility issues by:

• Replacing rm -rf commands in package.json scripts with npx rimraf for OS-agnostic file deletion
• Replacing cp commands with npx cpy-cli to ensure assets (like the locales directory) are copied correctly on all operating systems
• Refactoring path handling in src/utils/configuration/json.ts to use Node's path.join for cross-platform-safe path construction

Tickets?

• Closes Missing en.json File Error When Running Fleek CLI #47

Contribution checklist?

• The commit messages are detailed
• The build command runs locally
• Assets or static content are linked and stored in the project
• You have manually tested
• You have provided tests

Security checklist?

• Sensitive data has been identified and is being protected properly
• Injection has been prevented (parameterized queries, no eval or system calls)

Preview?

N/A

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Latest commit: 1a589c2

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