Add Dashboard

[gary-kim]

Fixes #158

I've run into a bit of an issue at the moment. Element Web stores the access_token for matrix encrypted in indexedDB so we're going to have to decrypt that. I'd rather just pull the same code used as a library from matrix-react-sdk but it's in a file that includes a lot of other things so we're going to have a lot of unneeded code flying around if we go that route. I'm probably going to copy over that section of the code into it's own file in this repo, properly credit it, and use it to get the decrypted access_token from indexedDB.