[Ayatana] Ubuntu Font as default for web site

[Brian Shannon <teapot.philosopher@xxxxxxxxxxxxxx>]

>    All five generic font families are defined to exist in all CSS
> implementations
>    (they need not necessarily map to five distinct actual fonts). User agents
>    should provide reasonable default choices for the generic font families,
>    which express the characteristics of each family as well as possible within
>    the limits allowed by the underlying technology. User agents are encouraged
>    to allow users to select alternative choices for the generic fonts.

Yes, yes, that's all well and good. However, that does not change the
fact that some websites would work better on a non-Ubuntu system and a
user could reasonably believe Ubuntu is broken (and in terms of de
facto standards for font sizes, they would be right).

Acting as if de facto standards are less important than official
standards leads to brokenness.

Brian