Add "About bitcoin.org" page
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
Merge pull request #212 from bitcoin/about

Add "About bitcoin.org" page
Add a line break between hardware wallets
Hardcode icons width and height in CSS
Make a subtle clarification in the text about volatility
Make some subtle clarifications in the text about instant transactions
Fix a typo
Improve text about reversible instant transactions and move it on "You need to know"
Merge pull request #213 from bitcoin/instanttxt

Improve text about reversible instant transactions and move it on "You need to know"
Merge branch 'master' into zh_CN
Update zh_CN translation