chore: update twitter handle in footer (#3299)
chore: update twitter handle in footer (#3299)

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chalin/angular.io,IdeaBlade/angular.io,angular/angular.io,angular/angular.io,IdeaBlade/angular.io,IdeaBlade/angular.io,IdeaBlade/angular.io,IdeaBlade/angular.io,angular/angular.io,angular/angular.io,angular/angular-cn,angular/angular-cn,angular/angular.io,angular/angular-cn,chalin/angular.io,chalin/angular.io,angular/angular-cn,chalin/angular.io,angular/angular-cn,chalin/angular.io