Fix Windows compatibility issue by replacing rm with rimraf

[ShubhamS2005]

Closes #179

I tried running the CLI on Windows and encountered the error:

'rm' is not recognized as an internal or external command

This occurs because some scripts in package.json use the Unix rm command,
which is not available on Windows environments.

To make the scripts cross-platform, I replaced rm with rimraf,
which works consistently on Windows, macOS, and Linux.

Changes made:

• Replaced rm -rf lib with rimraf lib
• Replaced rm -f oclif.manifest.json with rimraf oclif.manifest.json

Tested locally on:

• Windows 11
• Node.js v20

Code Change

Before:

"clean": "rm -rf lib",
"postpack": "rm -f oclif.manifest.json"

After:

"clean": "rimraf lib",
"postpack": "rimraf oclif.manifest.json"

Before

After

After this change, npm install and the CLI setup run successfully without the Windows error.

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