Find a generic way to know if the target playground is initialized.

[todo]

solar-components/docs/src/components/JSCodeBlock.jsx

Lines 56 to 61 in 5703c2c

	// @TODO: Find a generic way to know if the target playground is initialized.
	document.addEventListener('stencil_componentDidLoad', () => this.run());
	}
	run() {
	if (!this.executed) {

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This issue was generated by todo based on a TODO comment in 5703c2c when #120 was merged. cc @accera-tech.