fix(docs-infra): prevent extra space at the bottom of the page in Chrome (#28864)
fix(docs-infra): prevent extra space at the bottom of the page in Chrome (#28864)

The supposedly visually hidden `mat-icon` creates unnecessary space at
the bottom of the page (below the footer) in recent Chrome versions.
This didn't happen before and it still doesn't happen in other browsers
(Firefox, Edge, IE).

This commit fixes it by wrapping the icon in a visually hidden `div`
container, which doesn't have other styles (such as `mat-icon` does)
that could affect the layout of the page.

Fixes #28858

PR Close #28864

alexeagle/angular,juristr/angular,alexeagle/angular,manekinekko/angular,matsko/angular,IgorMinar/angular,mhevery/angular,IdeaBlade/angular,JiaLiPassion/angular,IdeaBlade/angular,petebacondarwin/angular,JiaLiPassion/angular,filipesilva/angular,IdeaBlade/angular,hansl/angular,mprobst/angular,jasonaden/angular,brandonroberts/angular,shairez/angular,matsko/angular,angular-indonesia/angular,gkalpak/angular,IgorMinar/angular,Toxicable/angular,filipesilva/angular,ocombe/angular,snaptech/angular,Brocco/angular,gnomeontherun/angular,angular/angular,sarunint/angular,angular-indonesia/angular,juristr/angular,alexeagle/angular,jasonaden/angular,snaptech/angular,gnomeontherun/angular,mlaval/angular,angular/angular,mprobst/angular,Toxicable/angular,mprobst/angular,filipesilva/angular,StephenFluin/angular,angular/angular,hansl/angular,gkalpak/angular,alxhub/angular,matsko/angular,StephenFluin/angular,alxhub/angular,sarunint/angular,vikerman/angular,petebacondarwin/angular,angular/angular,blesh/angular,sarunint/angular,sarunint/angular,alxhub/angular,snaptech/angular,alexeagle/angular,ocombe/angular,hansl/angular,mprobst/angular,blesh/angular,gdi2290/angular,angular-indonesia/angular,vikerman/angular,vikerman/angular,matsko/angular,mgechev/angular,gkalpak/angular,gkalpak/angular,mhevery/angular,blesh/angular,Brocco/angular,Toxicable/angular,Brocco/angular,snaptech/angular,shairez/angular,gnomeontherun/angular,mlaval/angular,wKoza/angular,mlaval/angular,ocombe/angular,manekinekko/angular,jasonaden/angular,mprobst/angular,alxhub/angular,mhevery/angular,mlaval/angular,shairez/angular,jasonaden/angular,Toxicable/angular,angular-indonesia/angular,wKoza/angular,manekinekko/angular,snaptech/angular,brandonroberts/angular,hansl/angular,JiaLiPassion/angular,mprobst/angular,sarunint/angular,petebacondarwin/angular,mgechev/angular,mhevery/angular,ocombe/angular,brandonroberts/angular,blesh/angular,JiaLiPassion/angular,mgechev/angular,petebacondarwin/angular,Toxicable/angular,Toxicable/angular,StephenFluin/angular,jasonaden/angular,matsko/angular,juristr/angular,wKoza/angular,petebacondarwin/angular,petebacondarwin/angular,juristr/angular,gdi2290/angular,shairez/angular,sarunint/angular,IgorMinar/angular,gdi2290/angular,alexeagle/angular,blesh/angular,manekinekko/angular,Brocco/angular,filipesilva/angular,manekinekko/angular,IgorMinar/angular,brandonroberts/angular,ocombe/angular,hansl/angular,juristr/angular,wKoza/angular,IgorMinar/angular,mgechev/angular,hansl/angular,wKoza/angular,StephenFluin/angular,wKoza/angular,mhevery/angular,Brocco/angular,jasonaden/angular,shairez/angular,alexeagle/angular,mlaval/angular,snaptech/angular,vikerman/angular,manekinekko/angular,IgorMinar/angular,mhevery/angular,gdi2290/angular,gnomeontherun/angular,mgechev/angular,vikerman/angular,vikerman/angular,gdi2290/angular,StephenFluin/angular,Brocco/angular,ocombe/angular,gdi2290/angular,brandonroberts/angular,brandonroberts/angular,alxhub/angular,filipesilva/angular,juristr/angular,IdeaBlade/angular,IdeaBlade/angular