Redesign the Exchanges page to make it like "Choose your Wallet"

[i-rme]

Currently the Exchanges page on Bitcoin.org (https://bitcoin.org/en/exchanges) is just a list of a few exchanges without any comment on them. There appears to be no scrutiny, no review nor comment on them, no requisite to be listed, there are no ways to compare them in any way to find what Exchange is the most trusted one.

Past events have showed us that most bitcoin users lose their coins not by choosing a bad wallet but by choosing the wrong Exchange. (MtGox, Bitfinex, Bitcurex, Bitquick, Shapeshift, Cryptsy, Bitstamp and many others (Full list https://magoo.github.io/Blockchain-Graveyard/)).

We must design the Exchanges page just like the "Choose your Wallet" one, we must categorize, scrutinize, review, flag and delist Exchanges that dont meet the minimum security requirements.

That way a novice user can make a wise decision and at the same time we can push for higher standards just like this website has already risen standards for web-wallets (See #663 regarding Blockchain.info).

I'll be happy to help with this as soon as this redesign starts.

[i-rme]

Furthermore, we could also inform users on Exchange fees, transfer/withdrawal fees and other cost associated with exchanging bitcoins. That way they would see the whole picture.

[kuzzmi]

Currently I'm finalizing the "Choose your wallet" refactor to individual pages (#1661) which should make these pages more accessible. So keeping this in mind, and if there is a need, I can work on this issue afterwards on the technical side, or to support anybody who will, if I don't have enough spare time.

Evaluation of security levels as well as deciding which exchange is "good" or "bad" will be hard for me to do, but I can think about structuring the data of the exchange websites, so the next person can enhance it with such information.