docs: Show examples of how to use templates API
docs: Show examples of how to use templates API

The template documentation is lacking inlined examples on how to use the
templates API, like binding children and callbacks. This makes looking
for best practices a bit harder than it ought to be, for a feature this
useful.

alexlarsson/gtk,alexlarsson/gtk,davidgumberg/gtk,jigpu/gtk,ahodesuka/gtk,alexlarsson/gtk,Adamovskiy/gtk,Lyude/gtk-,jigpu/gtk,alexlarsson/gtk,Adamovskiy/gtk,jadahl/gtk,ahodesuka/gtk,davidgumberg/gtk,Lyude/gtk-,Adamovskiy/gtk,jessevdk/gtk,jadahl/gtk,grubersjoe/adwaita,davidgumberg/gtk,jigpu/gtk,davidgumberg/gtk,ahodesuka/gtk,chergert/gtk,jessevdk/gtk,jadahl/gtk,alexlarsson/gtk,Adamovskiy/gtk,alexlarsson/gtk,chergert/gtk,grubersjoe/adwaita,grubersjoe/adwaita,ahodesuka/gtk,grubersjoe/adwaita,grubersjoe/adwaita,ahodesuka/gtk,Lyude/gtk-,jigpu/gtk,jessevdk/gtk,jadahl/gtk,davidgumberg/gtk,Adamovskiy/gtk,Lyude/gtk-,jadahl/gtk,chergert/gtk,jigpu/gtk,grubersjoe/adwaita,chergert/gtk,jessevdk/gtk,ahodesuka/gtk,jadahl/gtk,jadahl/gtk,jigpu/gtk,chergert/gtk,Adamovskiy/gtk,jigpu/gtk,jessevdk/gtk,Lyude/gtk-,Adamovskiy/gtk,jigpu/gtk,Lyude/gtk-,davidgumberg/gtk,ahodesuka/gtk,jessevdk/gtk,Lyude/gtk-,ahodesuka/gtk,davidgumberg/gtk,alexlarsson/gtk,davidgumberg/gtk,alexlarsson/gtk,chergert/gtk,jessevdk/gtk,jadahl/gtk,chergert/gtk,Lyude/gtk-,Adamovskiy/gtk,grubersjoe/adwaita,chergert/gtk,grubersjoe/adwaita