refactor(ReadMe): remove history/commit data from Readme

Let's create a lightweight component that is only used when we are looking at a versioned readme, so we can remove references to history and commits in the `ReadMe` component

app/components/ReadMe.tsx

@@ -9,7 +9,6 @@ const DEBOUNCE_TIMER = 1000
 
 export interface ReadmeProps {
  peername: string
- path: string
  name: string
  value: string
  preview: string

app/containers/ReadmeContainer.tsx

@@ -5,17 +5,14 @@ import Store from '../models/store'
 import { fsiWriteAndFetch, fetchReadmePreview } from '../actions/api'
 
 const mapStateToProps = (state: Store) => {
- const { workingDataset, commitDetails, selections } = state
- const history = selections.activeTab === 'history'
- const dataset = history ? commitDetails : workingDataset
- const { value } = dataset.components.readme
+ const { workingDataset, selections } = state
+ const { value } = workingDataset.components.readme
 
- const { peername, name, commit } = selections
+ const { peername, name } = selections
 
  // get data for the currently selected component
  return {
  peername,
- path: commit,
  name,
  value,
  history,