Add common HTML for all pages.

For #2.
Add two static articles.

For #2.
Merge branch '1-WebDesign' into 2-HtmlPrototype
Add About, FAQ and Try-it pages with dummy content.

For #2.
Merge branch '1-WebDesign' into 2-HtmlPrototype
Add About copy.
Merge branch '1-WebDesign' into 2-HtmlPrototype
Add Faq copy for #2.
Add Try-it copy for #2.
Add Dynamic HTML and Common PHP, for #4.
Update style for #1.