Add Cloudflare logo

[divyeshio]

Added cloudflare logo to the Logos section on the landing page, as Cloudflare uses tokio for Pingora, which can be cited here

[carllerche]

Thanks for the PR. To add logos, we need to get explicit approval from a representative of the organization with authority to approve the logo usage. The set of logos on the homepage is not intended to be exhaustive, more of a sample of who is using it.