Improve Proposal Component

[wilsoncusack]

Currently the proposal component has a toggle for "active" and "all proposals." We have gotten complaints that it is frustrating to have to toggle and scroll to find a proposal for which voting just ended. We can do better.

• No toggle, just all proposals
• Sorted by vote end block (i.e. newest proposals at the top)
• Use a ref to auto scroll so that the vote ending soonest starts at the top/start of the view, as it currently does.

We should couple this with #33 to ensure it is performant.