Change main fonts

[Issue #2]

Fonts changed to Baskerville SemiBold and STKaiti.
Change title for master slides

[Issue #2]

Slide title changed to blue-ish background, and left aligned.
Rearrange text to avoid long slide

[Issue #2]

DZSlides generation by Pandoc doesn't allow automatic side-by-side
layout, thus I have to remove lower level lists to ensure texts are all
visible within the page.
Change background and text color

[Issue #2]

Use cloth-style background and white font to increase contrast.