refactor: update readme and move svg to assets directory

[levivannoort]

Close: #5928

PR Details

Link: https://github.com/amplication/amplication/tree/refactor/readme

This pull request overhauls the README.md-file in the root of the repository.

Since the contributors overview as generated using a npm packages, we could get rid of the application integration on the organization.

I think we should have a different 'slogan' underneath the logo, and I am up for ideas on that.

PR Checklist

• Tests for the changes have been added
• npm test doesn't throw any error

IMPORTANT: Please review the CONTRIBUTING.md file for detailed contributing guidelines.

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[levivannoort]

@alexbass86 I can't assign you as a reviewer but please review the pull request.