<title> is incorrect

[asavageiv]

The <title> tag is currently:
<title>Welcome to the AAPS documentation — AndroidAPS 3.3 documentation</title>

But the current version is 3.4. This leads to confusing search results like this:

I propose we use a simple, stable, search friendly title like, "AndroidAPS Documentation".

For sub-pages it should be in reverse hierarchy order, so the left side of the name in browser tabs matches the sub-section. E.g.
Building AAPS - Setting up AAPS - AndroidAPS Documentation

I can put together a PR if this idea is acceptable to the maintainers.