modify about page css constrain images

[jamcgrath]

Description

modified the css styles
remove the inline width and height and put the values in the width and height attributes

Motivation and Context

fixes #176 (comment)

How Has This Been Tested?

tested in:
IOS Safari
Android: Chrome, firefox, samsung internet

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 not work as expected)

Checklist:

• My code follows the code style of this project.

[martinheidegger]

Lgtm