docs(bazel): Mention Alex Eagle's article on migration doc (#39507)
docs(bazel): Mention Alex Eagle's article on migration doc (#39507)

Alex Eagle wrote an external article on our decision to move Bazel out of
Angular repo, and it's useful for users who want to know more about what's next.

PR Close #39507

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