docs: Update README.md

[hijuliancode]

This update includes links to the official Rollup plugins.

Awesome Contribution Checklist:

• [x] I have read, and re-read the Contributing Guidelines
• [x] I have searched to ensure the suggested item doesn't exist on this list
• [x] This PR contains only one item

Please Provide a Link A Repository for Your Addition

Please Describe Your Addition

• Added official links for Rollup plugins.
• Removed Terser from the suggestions list and added it as an official Rollup plugin.