added .ipynb support

[gaardhus]

Description

Added custom icon and color for .ipynb files

Related Issue

#57

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[gaardhus]

Alternatively this is the glyph used in VS Code  (which also uses same color for .py and .ipynb files), I've tried adding it to the glyhps.ps1 file, but it does not render in PowerShell.

[gaardhus]

After digging around I found the right glyph, it just rendered in a weird way initially. I chaged the glyph and color in the last commit to reflect this, and the other implementations in this package.

However, I guess it can still be discussed if .ipynb files should have the same color as .py files, since they can also be used for other languages.

[devblackops]

What about orange (#E46E2E) for the color? That's what the theme seems to be on jupyter.org.