Update "Angular Renaissance" examples to v19

[LcsGa]

Angular v19 just landed and keeps simplifying the framework:

• standalone: true is now the default on components, directives and pipes
• new resource API with signals or observables
• new linkedSignal API with signals (unfortunately there is no example that could demo it)

[dinnerhe]

Removed all standalone: true here #283
However I don't think resource and linkedSignal API needs to be implemented now as they are still experimental features Link Link2

[LcsGa]

Nice PR 👌🏼
Yeah they might be avoided for now I guess (even though I'll definitely use them in production as I always do 😎😂)

[LcsGa]

Especially linkedSignal that is in dev preview!
Btw we added dev preview features in these examples (afterNextRender and effect for example) 🙄