[Documentation request]: Comparison page

[CodeDoctorDE]

To which page is your issue related?

Some people ask how it compares to OneNote, Obsidian, Excalidraw, Xournal++, ...

Describe your documentation request!

Add a comparison page how butterfly compares to other apps.

Features could be

• Opensource/Costs
• Platforms
• Custom colors
• Handwritten
• Export options
• Canvas type (onenote has only infinite canvas in the positive coordinates for example
• or more...

Additional context

Feel free to comment here if you want to work on this

Code of Conduct

• [x] I agree to follow this project's Code of Conduct