[README] Dark mode support: Add light versions of logos

[leecalcote]

Current Behavior

This repo's readme.md (https://github.com/layer5io/.github/blob/master/profile/README.md) assumes light mode visitors.

Desired Situation Use GitHub's relatively new ability to define [light and dark mode images](More context - https://github.blog/changelog/2021-11-24-specify-theme-context-for-images-in-markdown/) in markdown for each of the logos.

Find light and dark mode flavors of each of the logos here: https://layer5.io/brand or in the shared, community drive.

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Contributor Resources

The layer5.io website uses Gatsby, React, and GitHub Pages. Site content is found under the master branch.

• See contributing instructions
• See Layer5 site designs in this Figma project. Join the Layer5 Community for access.

[poly4concept]

I would love to work on this pls assign it to me

[SaNsK11]

I would like to work on it. Can you assign it to me @leecalcote

[leecalcote]

Oops... I missed, @poly4concept's earlier message. I'm assigning to both of you assuming that @poly4concept has moved on...

[stale[bot]]

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[stale[bot]]

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