Include Node Versions

[nimit2801]

Describe the bug
The CSSIFY Backend won't run in the most recent version of the node eg 15.xx and above.
There's this dependency called node-sass which requires a version of node 14.xx and below for windows and other OS.

To Reproduce
Steps to reproduce the behavior:

1. Go to the terminal/cmd cd cssify/backend
2. npm run dev
3. The client is deployed.
4. But the backend stops because of this error.

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

Screenshots
https://github.com/sass/node-sass/releases/tag/v4.14.1

Desktop

• OS: Windows x64
• Browser Mozilla
• Version 85.0.1 (64-bit)