add .ipynb icon

[gaardhus]

Expected Behavior

Thanks for a great module! I suggest that a custom icon for .ipynb files are adopted.

Current Behavior

Possible Solution

Icon: '.ipynb' = 'nf-mdi-book'
Color: '.ipynb' = '16c60c'

Steps to Reproduce (for bugs)

Context

It would really make it easier and more intuitive to spot the notebooks in my directories :)

Your Environment

• Module version used:
• Operating System and PowerShell version:

[devblackops]

Sounds good @gaardhus. Do you want to submit a PR with this?

[gaardhus]

Right away @devblackops