Remove missing package main entry

[Jamil Ur Rehman Ahmadzai (jamilahmadzai)]

Summary

• remove the package main entry that points to dist/contentful.js
• keep the existing bin.contentful CLI entry unchanged

Why

contentful-cli is published as a CLI package, but its package metadata currently advertises dist/contentful.js as the package main. That file is not present in the repository or published package tarball, so consumers and package validators see a broken entry point.

The CLI entry remains bin/contentful.js, which loads dist/lib/cli.js after the package build.

Fixes #3285.

Validation

• node -e "const p=require('./package.json'); console.log({hasMain:Object.prototype.hasOwnProperty.call(p,'main'), bin:p.bin})"
• npm pack --dry-run --json .
• packed tarball package/package.json inspection confirmed no main entry and unchanged bin.contentful
• git diff --check