Update mentions of Console

[jiribenes]

The following excerpts from the "Concepts > Effect Handlers" page are really outdated, mentioning Console:

effekt-website/docs/concepts/effect-handlers.md

Lines 7 to 9 in 8799da2

	# An Introduction to (Algebraic) Effect Handlers
	Besides the built-in functions like `println` that have effects (e.g. `Console`),
	which are tracked by the effect system, Effekt also offers _user definable control effects_.

... and the notion of "builtin effects"

effekt-website/docs/concepts/effect-handlers.md

Lines 50 to 53 in 8799da2

	> **Remark**
	> Builtin side-effects like printing to the console are tracked, but cannot
	> be handled, and their semantics is fixed. Hence, we do not track them as
	> effects, but as [second-class _resources_](https://doi.org/10.1145/3527320).

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For effect handlers in particular, it might be worth it to cross-reference them with the Tour: the page Tour > Captures has a nice explanation of captures, but the Concepts > Effect Handlers seem a better intro to handling than the Tour > Effect Handlers.