Add “Promote to Production” feature

[daneden]

Deployment views should have a “Promote to Production” button, similar to the “Redeploy” button.

On Vercel’s site, the “Promote to Production” button sends a POST request to https://vercel.com/api/v13/deployments with the following (demo) payload:

{
   "name":"de-gifs-client",
   "gitSource":{
      "ref":"dependabot/npm_and_yarn/next-12.3.1",
      "repoId":226575636,
      "sha":"b6c5d5fbf8496c4b7c281b978b5709094448ce26",
      "type":"github",
      "prId":null
   },
   "target":"production"
}