docs(Mvux): added sample repo for all tutorials

[roubachof]

added the links to sample repo at the beginning.

Some remarks as well:

Overview

I feel it misses the main point: "how do we ensure we have a coherent state throughout the app?"

Do you ever ended in the situation where you have to pass object between view models?
Did you ever awaited the result of a page to obtain an updated object?
Or even worse...
SEND AN UPDATED OBJECT VIA A MEDIATOR PATTERN TO ALL YOUR VIEW MODELS!
crowd in shock
And how it made you feel?
Bad uh? Like sick to the stomach bad...
Wouldn't it be better to be sure that the state of an object is distributed to all subscribers as soon as it's updated?
Wouldn't it be rad if you didn't have to bother subscribing and unsuscribing to events to do so?

Or maybe I didn't understand what mvux is about :)
It could very well be the case cause I didn't find a sample showcasing this use case...

Feeds.md

// note that a service does not normally hold data
// this example is for demonstration purposes

Why not? The service layer could cache data by using local repositories or even caching it itself if using a repository pattern is overkill.
Also, if we want to have a coherent state dispatched to all our models, it should be stored in the service layer.

[nickrandolph]

Thanks for the awesome feedback! I've extracted the comments from above into a separate issue

[welcome]

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