Add gRPC and GraphQL to the solution pages

[oleg-nenashev]

Summary:

• Add section for protocols on the Docs landing
• Add GraphQL solution page
• Extend the GraphQL page a bit, add graphics
• Add WireMock Cloud as a distribution

Screenshots

Submitter checklist

• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• If the change against WireMock 2 functionality (incompatible with WireMock 3),
  it is submitted against the 2.x branch
• The repository's code style is followed (see the contributing guide)

Details: Contributor Guide

[oleg-nenashev]

Got 👍 from @tomakehurst in the chat