Demo walkthroughs for HTML, CSS, JS

[aidankmcl]

Itemized to track progress

HTML

• Figure out what to say about HTML in talk and add to README as intro
• Figure out what change to make to the HTML as part of the demo
• Research potential learning materials for HTML

CSS

• Figure out what to say about CSS in talk and add to README as intro
• Figure out what change to make to the CSS as part of the demo
• Research potential learning materials for CSS

JS

• Figure out what to say about JS in talk and add to README as intro
• Figure out what change to make to the JS as part of the demo
• Research potential learning materials for JS