docs: change Zeit -> Vercel (#42285)
docs: change Zeit -> Vercel (#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 #38141

PR Close #42285

brandonroberts/angular,JiaLiPassion/angular,gkalpak/angular,shairez/angular,ocombe/angular,manekinekko/angular,ocombe/angular,ocombe/angular,JiaLiPassion/angular,JiaLiPassion/angular,brandonroberts/angular,angular/angular,gnomeontherun/angular,gkalpak/angular,mgechev/angular,gnomeontherun/angular,angular-indonesia/angular,gkalpak/angular,brandonroberts/angular,gkalpak/angular,gnomeontherun/angular,brandonroberts/angular,angular/angular,manekinekko/angular,mgechev/angular,angular/angular,mgechev/angular,ocombe/angular,ocombe/angular,angular-indonesia/angular,manekinekko/angular,shairez/angular,mgechev/angular,manekinekko/angular,manekinekko/angular,shairez/angular,manekinekko/angular,angular/angular,shairez/angular,angular-indonesia/angular,JiaLiPassion/angular,gnomeontherun/angular,brandonroberts/angular,mgechev/angular,shairez/angular,brandonroberts/angular,angular-indonesia/angular,ocombe/angular