Update Sidebar menu UX

[AlexLakatos]

• Rename "Home" to "Accounts"
• remove the accordeon for transfers, and make both options part of the sidebar, as "Pay" and "Request"
• create a new icon for "Request"

I've attached a quick mockup, but the Request icon needs a completely new design.

[huijing]

@Tymmmy @AlexLakatos As I was going through each of the testnet screens for discussion with Madalina, I have a tweak for this particular issue which would remove the need for a new icon from her.
If you look at the Home (or Accounts) screen today, we already have icons and links for "Send" and "Request". For the sake of consistency, I strongly suggest we use the same words and icons.
So the proposed sidebar would look like this instead:

In addition, if we are putting "send" and "request" as discrete links in the nav, do we want to update the urls of those pages to /send and /request instead of /transfer/send and /transfer/request? Is the /transfer/* part necessary?