Add 'strategy' section in the FAQ

Purism news often raise a loft of questions, some of which are recurrent. Among the questions I answer the most frequently are the following:

Why didn't they chose Plasma Mobile? It's much more advanced
Why won't they help Plasma Mobile as they promised?
Do they support GNOME/push code upstream? (though, this questions happens less and less frequently as time passes)
Porting GNOME to a mobile device is an ugly hack
Their phone shell doesn't use GNOME technology
Why hacking GTK+ 3 which is already obsolete?
Their compositor is a fork of wlroots's example compositor rootston, which the founder told them in strong words not to do (actually he supports the project)
Their code is not likely to make it to GTK+ 4 and GNOME Shell 4

The FAQ could benefit from a 'strategy' section answering some of those questions.

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