Minor changes to make two columns look better

[philidem]

These were minor tweaks to make two columns look a little better.

• Justify text within the "marketing" columns
• Center h3 in marketing column
• Change heading to: Marko: HTML Templating
• Changing heading to: Marko Widgets: UI Components

[philidem]

@yomed please let me know what you think.

[yomed]

Cool, I think this makes sense in the mean time. Btw, I don't think anybody supports text-justify.

[philidem]

You're right about text-justify... I shouldn't have read w3schools so quickly (man that site is bad...)

[patrick-steele-idem]

I'm not sure how I feel about the header prefixes (i.e. "Marko: " and "Marko Widgets: "). I also think the headers should still be left aligned.