facts: Add graph for facts endpoint.
_macros.html: Add a second Pie chart to facts/<fact>

The second chart is in order of the value of the fact. So in the
uptime fact we see 1 day before 2 days before 50 days.
_macros.html: mod ensure different adjecent colors
_macros.html: Graphs a bit smaller, FlatUI colors.

Currently the graphs are shown at the top of the page and because of
that really take up a lot of screen real estate. This commit makes the
graphs a bit smaller but we really need to rethink the layout here.

Additionally we switch the colors to the FlatUI swatches to match the
rest of the theme better.