Create dataset info drawer (#1805)

* create infoDrawer

* create read/writes to redux store

* reimplement reducer that vanished

* remove aboutURL stuff from title

* add formatting and style

* s/length/size and make metadata items list items

* remove comment

* remove empty singletons

* refactor into async react component

* Clean up skeleton

* swap out for loop for map

* add comment

* replace placeholder

* switch ternary for `&&`

* event handling fixes and PR feedback

* add button and move click handler to button

* ditch empty categories

* move drawer button handling to redux

* remove categorical move note

* PR feedback from colin

* update snapshot

* remove hover state

client/src/reducers/controls.js

@@ -20,6 +20,9 @@ const Controls = (
     scatterplotXXaccessor: null, // just easier to read
     scatterplotYYaccessor: null,
     graphRenderCounter: 0 /* integer as <Component key={graphRenderCounter} - a change in key forces a remount */,
+
+    singletonHover: false,
+    datasetDrawer: false,
   },
   action
 ) => {
@@ -162,6 +165,12 @@ const Controls = (
         scatterplotYYaccessor: null,
       };
 
+    /**************************
+          Dataset Drawer
+     **************************/
+    case "toggle dataset drawer":
+      return { ...state, datasetDrawer: !state.datasetDrawer };
+
     default:
       return state;
   }