Added link to demo repo

Applied PRs from labs

Fixed lab typos

First draft of lab

Switched to express from polymer CLI for main web server

Added typescript rollup plugin

Removed compiled output

Switched to open-wc es-dev-server

Merge pull request #1 from kito99/dependabot/npm_and_yarn/app-three/handlebars-4.5.3

Merge pull request #2 from kito99/dependabot/npm_and_yarn/app-two/handlebars-4.5.3

Bump handlebars from 4.2.0 to 4.5.3 in /app-two

Bump handlebars from 4.2.0 to 4.5.3 in /app-three

Update README.md

Attempted to fix image link

Final cleanup (READMEs, removing unused code, etc)