[Update existing functionality] Option to override github profile photo in repository block

[robertdevore]

Enhancement

Description

When you're adding a bunch of repository blocks, it'd be nice if we were able to add a custom image/thumbnail to the block that overrides the default image - (screenshot)

Context

Not only would it give devs a way to visually set their repos apart on a page, it'd help people like me who have their face as the avatar and would rather not see it a dozen times on the page 😂

[DevinWalker]

Great suggestion and can do! ✅