[feat][npm publish]exclude unnecessary files to be included in npm package

[davidkhala]

exclude unnecessary files to be included in npm package

A small PR without linked to any issue

Motivation

After I investigate the node_modules I get via npm install, I see some source files leakage as redundency to end user

Modifications

Via this change, the folder tests/ and .github will be exluded in next npm publish release

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Documentation

• doc-not-needed

[shibd]

Hi, @davidkhala should add license to .npmignore, or ignore it.

Using ignore file
✗ License not found in .npmignore
License check failed. 1 file(s) did not have the license.
Command failed

[davidkhala]

@shibd does it look good now?