Defines what a component is and is used for #283
Merged
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On the Building a Simple Component page, we jump right into building a
component without defining what a component is or what they are use for.
This change adds a brief definition (the same one used in
https://guides.emberjs.com/v3.5.0/components/defining-a-component/) and
a reason why the user might want to use them.
This addresses one of the "tiny tutorial fixes" @jenweber listed
in #245.