[SoaS] Mirabelle page updated

[Mel Chua]

>> It's got shiny on it now - links are updated as well, and so forth.
>>
>> http://wiki.sugarlabs.org/go/Sugar_on_a_Stick/Mirabelle

Thanks to Fred Grose for recent edits/cleanups - I took another pass
and also added a section for press coverage of Mirabelle,
http://wiki.sugarlabs.org/go/Sugar_on_a_Stick/Mirabelle#Press_coverage.
So far I only know of one article, so if you've seen others, please
add more. (Copying Marketing, too.)

--Mel