All the docs related files (docs-app, doc-gen, content, etc)
are now to be found inside the `/aio` folder.
The related gulp tasks have been moved from the top level
gulp file to a new one inside the `/aio` folder.
The structure of the `/aio` folder now looks like:
```
/aio/
  build/         # gulp tasks
  content/       #MARKDOWN FILES for devguides, cheatsheet, etc
    devguides/
    cheatsheets/
  transforms/    #dgeni packages, templates, etc
  src/
    app/
    assets/
    content/    #HTML + JSON build artifacts produced by dgeni from /aio/content.
                #This dir is .gitignored-ed
  e2e/           #protractor tests for the doc viewer app
  node_modules/ #dependencies for both the doc viewer builds and the dgeni stuff
                #This dir is .gitignored-ed
  gulpfile.js   #Tasks for generating docs and building & deploying the doc viewer
```
Closes #14361
		
	
			
		
			
				
	
	
		
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| {%- if doc.howToUse %}
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|   <!-- QUICK REFERENCE CODE EXAMPLE -->
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|   <section class="how-to-use">
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|     <h2>How To Use</h2>
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|     <div class="description">
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|       {$ doc.howToUse | marked $}
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|     </div>
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|   </section>
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| {% endif %}
 |