feat(showcase): add getambassador.io (#9582)
feat(showcase): add getambassador.io (#9582)

Adds the documentation site for the Ambassador API gateway to the Gatbsy Showcase.
mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,0x80/gatsby,gatsbyjs/gatsby,0x80/gatsby