Clarify the "Get Starting" tutorial

[bguyl]

As I wanted to start quickly, I copy/paste a large part of the code from the tutorial.
I couldn't make it work and it took me some time to understand why.

On page 3, the blog component is added.
I didn't pay attention and because there were no // ... comment at the end, I assumed the new code had to be add at the bottom.

Thus, because they are function expressions, the order is important and they should be declared before used.

I think the router component should appear in this page to avoid confusion.

[MoOx]

Will do. Thanks for the precious feedback. Remember that we have the entire tutorial as example here https://github.com/phenomic/phenomic/tree/master/examples (I will make this more visible in the tutorial so if people have doubts, they can refer to this)