docs: Update Universal Story to include module map

[RicardoVaranda]

@nguniversal/module-map-ngfactory-loader has been release and with it, support for Lazy loading!

This PR updates the existing story to guide users how they can use this functionality.

Closes: #7706

[filipesilva]

@alxhub can you have a look?

[cyrilletuzi]

Bad idea to put the Universal files in the same directory as normal build, I've tried this option and it causes issues. Better stay in another directory.

[RicardoVaranda]

Thanks for the suggestion @cyrilletuzi I'll apply those changes now 😄 Just out of curiosity what are the issues caused by having it within the dist?

[cyrilletuzi]

I don't remember exactly, but good chances it was a problem of wrong import paths (as it's in a subdirectory) or a conflict on some building steps as files are in the same main directory.

[MarkPieszak]

Didn't see this PR in there, but added TypeScript (changes similar to these) and other fixes @vikerman requested here: #7796

[genyklemberg]

I used this answer, it is about firebase deploy, but main logic is simple https://hackernoon.com/deploy-angular-universal-w-firebase-ad70ea2413a1

[RicardoVaranda]

Overwritten by #7803

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