Remove broken "Consensus" tab from UI and related code (#434)

* Remove consensus-tab related stuff, and unused messages, from the telemetry backend

* also remove AfgAuthoritySet feed message, and handle same from node

* Blat everything consensus related that I can find in the UI

* cargo fmt

* README: had -> has

Co-authored-by: David <dvdplm@gmail.com>

Co-authored-by: David <dvdplm@gmail.com>

frontend/src/App.tsx

@@ -101,11 +101,6 @@ export default class App extends React.Component<{}, {}> {
       status: 'offline',
       best: 0 as Types.BlockNumber,
       finalized: 0 as Types.BlockNumber,
-      consensusInfo: new Array() as Types.ConsensusInfo,
-      displayConsensusLoadingScreen: true,
-      authorities: new Array() as Types.Authorities,
-      authoritySetId: null,
-      sendFinality: false,
       blockTimestamp: 0 as Types.Timestamp,
       blockAverage: null,
       timeDiff: 0 as Types.Milliseconds,