Build Assessment Dashboard View / Overview

Description

Design the overview of all assessment for a single Concept Tree (referenced by the root MEW address)

Specs are in sketches/Assessment Dashboard.pdf

We need a dashboard to over view Past, Current and Potential assessments because

Visualize Past Assessments to keep track of rewards
Visualize current assessments to commit/reveal when needed
Visualize Potential assessments (ie to which you've been randomly selected) to stake on them before it's too late

watcher: @djudjuu