[Docs] Replace image in README file

[Atinuke Oluwabamikemi Kayode]

Current #State:
See the white background between the man and woman in the image below that needs to be updated to a better version in the README file.

Desired State:
This is the desired image.

Replace with the image below.

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Contributor Resources

• Meshery documentation site
• Meshery documentation source
• Instructions for contributing to documentation

[Lakshya Gupta]

Hey @iambami can I work on this?

[Anish Saraogi]

I have resolved the issue and create a PR

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