Add note to `Tailwind` and FAQ regarding the `production` prop and Gmail

[shellscape]

• Component or Package Name: jsx-email
• Component or Package Version: latest

Documentation Is:

• [ ] Missing
• [x] Needed
• [ ] Confusing
• [ ] Not Sure?

Please Explain in Detail...

The docs need a small update to include language on the Tailwind component's production prop, and how it's beneficial to use with Gmail for css compatibility due to class name restrictions. Also needs to go on the FAQ

Your Proposal for Changes

☝️