NextJS fails to compile due to global CSS dependency in node modules

[gavindoughtie]

A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:
Include the rich markdown editor component in a component rendered server-side by nextjs

Expected behavior
A clear and concise description of what you expected to happen.

Version
12.0.0-beta.0
(using with React 18 beta)

Screenshots
If applicable, add screenshots or videos to help explain your problem.

./node_modules/katex/dist/katex.min.css Global CSS cannot be imported from within node_modules. Read more: https://nextjs.org/docs/messages/css-npm Location: node_modules/rich-markdown-editor/dist/nodes/Math.js

Desktop (please complete the following information):

• OS: [e.g. iOS]
  OSX
• Browser [e.g. chrome, safari]
  Chrome
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

[tommoor]

Please see this issue: #303

The component does not support SSR at this time so you should ensure window is available.