feat: add Vue Router section

[afontcu]

• showcase how to mock Vue Router.
• showcase how to use router-link-stub (source).
• avoid common pitfalls when trying to assert against a URL.

[lmiller1990]

I would like to work on this one. I learned a lot about the new Vue Router and the pitfalls (see here for example).

I think this article can go something like this:

• example w/o mock
• discuss async routing, flush promises, nextTick
• demonstrate mocking Vue Router
• discuss pros/cons of each approach

[afontcu]

Sounds great!

[posva]

Ping me for a review when you have something. I already had some ideas about things to add so I could help on this one

[lmiller1990]

@posva will do, would be great to get your review. Anything you think is especially important to mention?

[posva]

Nothing specific but it would be useful being able to change the current location easily

[lmiller1990]

I will hold off on this one until we discuss router testing more here: vuejs/test-utils#152

[afontcu]

Closed in #43

[lmiller1990]

We might want to consider adding something about Vue Mock Router: https://github.com/posva/vue-router-mock

[afontcu]

Right! Let me create a new issue