docs: change Zeit -> Vercel (angular#42285)

In the deployment guide on AIO, change the Zeit company name to Vercel.
This is because Zeit rebranded to Vercel. Also update link to point to
Vercel's page about angular.

Fixes angular#38141

PR Close angular#42285

aio/content/guide/deployment.md

@@ -76,7 +76,7 @@ In the table below, you can find a list of packages which implement deployment f
 |---------------------------------------------------------------|--------------------------------------------------------------------------------|
 | [Firebase hosting](https://firebase.google.com/docs/hosting)  | [`@angular/fire`](https://npmjs.org/package/@angular/fire)                     |
 | [Azure](https://azure.microsoft.com/en-us/)                   | [`@azure/ng-deploy`](https://npmjs.org/package/@azure/ng-deploy)               |
-| [Now](https://zeit.co/now)                                    | [`@zeit/ng-deploy`](https://npmjs.org/package/@zeit/ng-deploy)                 |
+| [Vercel (Previously known as Zeit)](https://vercel.com/solutions/angular)                                    | [`@zeit/ng-deploy`](https://npmjs.org/package/@zeit/ng-deploy)                 |
 | [Netlify](https://www.netlify.com/)                           | [`@netlify-builder/deploy`](https://npmjs.org/package/@netlify-builder/deploy) |
 | [GitHub pages](https://pages.github.com/)                     | [`angular-cli-ghpages`](https://npmjs.org/package/angular-cli-ghpages)         |
 | [NPM](https://npmjs.com/)                                     | [`ngx-deploy-npm`](https://npmjs.org/package/ngx-deploy-npm)                   |