Add "About bitcoin.org" page

[saivann]

This pull request can be previewed live here : http://bitcoinabout.zapto.org/en/about-us

Explain bitcoin.org and Bitcoin ownership
Serve a basic idea of the goals of bitcoin.org
Give required instructions in order to help with bitcoin.org

A proof-reading is required for accuracy, typos and agreements on the goals of bitcoin.org.

[gmaxwell]

I'd strike "miners" from "bitcoin users and miners"— miners are users too, so its redundant. :)

Nice page in general!

[saivann]

@gmaxwell: Thanks! Done.

Unless someone wants to add something or ask for a delay, I should merge this branch later tomorrow.

[nanotube]

Then.. who controls Bitcoin? <- add another dot to make a proper ellipsis.

When submitting a pull request, please take required time to discuss your changes and adapt your work when required. <- delete the first 'required', one is enough.

this in addition to changes noted above and mentioned on irc.

looks pretty good generally! :)