Various improvements to cluster charts in roy, design effect, and width of confidence interval.

Signed-off-by: Mark White <mark@markewhite.com>
Here's hoping the new repository works.

Signed-off-by: Mark White <mark@markewhite.com>
Added in tutorials. Still need to decide how to handle references to htmls — either through the doc or keep them in the messy tree node.

Signed-off-by: Mark White <mark@markewhite.com>