style: Add new L2 comparison image, update overview page with image

[stackaccount1]

Create and add new l2 comparison image, update overview page in the user docs with image.

Description

Added the below L2 comparison chart to overview page in user docs

Motivation and Context

I thought maybe there is a cleaner way to represent this comparison chart.

How Has This Been Tested?

Local on my computer

Screenshots (if appropriate):

Types of changes

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

Checklist:

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