fix: Expose GLightbox as lhGlightbox to window

[ckanitz]

Todo stuff like

document.addEventListener('DOMContentLoaded', () => {
	const paragraphs = document.querySelectorAll('p');
	const elements = [];
	paragraphs.forEach((paragraph) => {
		elements.push({
			content: paragraph.innerHTML,
		});
	});
	const lb = window.lhGlightbox({ elements });
	lb.open();
});

On projects utilizing lh basics plugin.
This makes allready loaded lightbox code reusable instead of bundling own versions