closes #1818 Previously, the markdown of some chapters was converted to Jade markup to support the conditional exclusion of TS prose parts in Dart chapters. This commit reverts some of that back to clean markdown, thanks to a few custom directives.
		
			
				
	
	
		
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include ../_util-fns
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+includeShared('{ts}', 'intro')
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+includeShared('{ts}', 'main')
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