Rework questions redux/selectors

frontend/src/Routes.jsx

frontend/src/lib/redux.js

frontend/src/questions/Questions.css

frontend/src/questions/components/ActionHeader.css

frontend/src/questions/components/ActionHeader.jsx

frontend/src/questions/components/Item.jsx

frontend/src/questions/components/LabelPopover.jsx

frontend/src/questions/components/List.css

frontend/src/questions/components/List.jsx

frontend/src/questions/components/QuestionsList.jsx

frontend/src/questions/components/SearchHeader.css

frontend/src/questions/components/Sidebar.css

frontend/src/questions/components/Sidebar.jsx

frontend/src/questions/components/SidebarLayout.jsx

frontend/src/questions/containers/EntityBrowser.jsx

frontend/src/questions/containers/EntityItem.jsx

frontend/src/questions/containers/EntityList.jsx

frontend/src/questions/duck.js

frontend/src/questions/selectors.js

package.json