Add CSS nesting for better code usability

[ionut]

Add CSS nesting to cosmoz-toggle. Ex:

       `.toggle {
	appearance: none;
	width: 35px;
	height: 18px;
	display: inline-block;
	position: relative;
	border-radius: 18px;
	overflow: hidden;
	outline: none;
	border: none;
	cursor: pointer;
	background: var(--cz-toggle-color, #101010);
	transition: background-color ease 0.25s;
	margin: 0;

	&::before {
		content: '';
		display: block;
		position: absolute;
		z-index: 2;
		width: 14px;
		height: 14px;
		background: var(--cz-toggle-thumb-color, #15b0d3);
		left: 2px;
		top: 2px;
		border-radius: 50%;
		transition: all cubic-bezier(0.3, 1.5, 0.7, 1) 0.25s;
	}

	&:checked {
		background: var(--cz-toggle-checked-color, #66d7f0);

		&::before {
			left: 19px;
		}
	}

	+ label {
		padding-left: 16px;
		font-size: 14px;
		line-height: 18px;
		cursor: pointer;
		user-select: none;
	}

	&[disabled] {
		opacity: 0.6;
		cursor: not-allowed;
	}
}`