chore(examples): revert back to stable TS
chore(examples): revert back to stable TS

The new router once required TS1.9 but it doesn't anymore. It's best to revert our examples to TS 1.8 since that is what we tell users to install, and we want to be testing on the current setup.
angular/angular.io,angular/angular-es,chalin/angular.io,juleskremer/angular.io,patou/angular-fr,rsreimer/angular.io,angular/angular.io,angular/angular.io,slm-sum/angular-ja,onyoon7/angular-ko,ziarti/angular-fr,naomiblack/angular.io,angular/angular-es,angular/angular.io,Urigo/angular.io,onyoon7/angular-ko,ziarti/angular-fr,rsreimer/angular.io,GuzmanPI/angular-es,juleskremer/angular.io,Adam-Meisen/angular.io,chalin/angular.io,angular/angular-es,angular/angular-cn,Adam-Meisen/angular.io,SaloGala/angular-es,NoahLuftYang/angular-ko,kwalrath/angular.io,patou/angular-fr,angular/angular-es,angular/angular.io,IdeaBlade/angular.io,tonygoussot/angular-fr,ziarti/angular-fr,juleskremer/angular.io,ziarti/angular-fr,slm-sum/angular-ja,juleskremer/angular.io,onyoon7/angular-ko,angular/angular-fr,realappie/angular.io,tonygoussot/angular-fr,IdeaBlade/angular.io,gyujincho/angular-ko,Adam-Meisen/angular.io,SaloGala/angular-es,kwalrath/angular.io,Urigo/angular.io,gyujincho/angular-ko,gyujincho/angular-ko,onyoon7/angular-ko,SaloGala/angular-es,onyoon7/angular-ko,Adam-Meisen/angular.io,angular/angular-ko,tonygoussot/angular-fr,tonygoussot/angular-fr,IdeaBlade/angular.io,gyujincho/angular-ko,kwalrath/angular.io,angular/angular-cn,gyujincho/angular-ko,Urigo/angular.io,angular/angular-cn,angular/angular-ko,rsreimer/angular.io,slm-sum/angular-ja,realappie/angular.io,angular/angular-cn,naomiblack/angular.io,juleskremer/angular.io,ziarti/angular-fr,slm-sum/angular-ja,Adam-Meisen/angular.io,angular/angular-fr,realappie/angular.io,IdeaBlade/angular.io,angular/angular-es,tonygoussot/angular-fr,realappie/angular.io,angular/angular-ko,angular/angular-ko,naomiblack/angular.io,GuzmanPI/angular-es,chalin/angular.io,NoahLuftYang/angular-ko,realappie/angular.io,angular/angular-fr,NoahLuftYang/angular-ko,NoahLuftYang/angular-ko,angular/angular-fr,GuzmanPI/angular-es,NoahLuftYang/angular-ko,Urigo/angular.io,naomiblack/angular.io,patou/angular-fr,angular/angular-fr,rsreimer/angular.io,GuzmanPI/angular-es,SaloGala/angular-es,chalin/angular.io,kwalrath/angular.io,angular/angular-cn,slm-sum/angular-ja,rsreimer/angular.io,GuzmanPI/angular-es,SaloGala/angular-es,naomiblack/angular.io,IdeaBlade/angular.io,patou/angular-fr,Urigo/angular.io,patou/angular-fr,angular/angular-ko,kwalrath/angular.io,chalin/angular.io