Remove insight.Dimension from docs

This class is only used internally, so should not clutter the docs.
Use @link for linear line type

We already used an address, but JSDocs needs to be told that it should
be a link. We now properly link, and hide it behind a link caption.
Use @link between docs pages

Links the Axis.tickLabelFormat to the insight.Formatters.
Be explicit about DataSet in series constructor

Clarifies that this is supposed to be an insight type.
Remove optional from addX/YAxis
Add missing type to setInteractiveAxis

While it is heavily implied that setInteractiveAxis takes an axis, we
should be explicit!
Return {this} for Table asc/desc

The comments already said we returned {this}, but now we match the rest
of the documentation.