Moved dev shell into fixtures/devtools

fixtures/devtools/app/DeeplyNestedComponents/index.js renamed

fixtures/devtools/app/EditableProps/index.js renamed

fixtures/devtools/app/ElementTypes/index.js renamed

fixtures/devtools/app/Hydration/index.js renamed

fixtures/devtools/app/Iframe/index.js renamed

fixtures/devtools/app/InspectableElements/Contexts.js renamed

fixtures/devtools/app/InspectableElements/CustomHooks.js renamed

fixtures/devtools/app/InspectableElements/CustomObject.js renamed

fixtures/devtools/app/InspectableElements/InspectableElements.js renamed

fixtures/devtools/app/InspectableElements/NestedProps.js renamed

fixtures/devtools/app/InspectableElements/SimpleValues.js renamed

fixtures/devtools/app/InspectableElements/index.js renamed

fixtures/devtools/app/InteractionTracing/index.js renamed

fixtures/devtools/app/PriorityLevels/index.js renamed

fixtures/devtools/app/ReactNativeWeb/index.js renamed

fixtures/devtools/app/SuspenseTree/index.js renamed

fixtures/devtools/app/ToDoList/List.css renamed

fixtures/devtools/app/ToDoList/List.js renamed

fixtures/devtools/app/ToDoList/ListItem.css renamed

fixtures/devtools/app/ToDoList/ListItem.js renamed

fixtures/devtools/app/ToDoList/index.js renamed

fixtures/devtools/app/Toggle/index.js renamed

fixtures/devtools/app/console.js renamed

fixtures/devtools/app/index.js renamed

fixtures/devtools/app/styles.css renamed

fixtures/devtools/index.html renamed

fixtures/devtools/now.json renamed

fixtures/devtools/src/devtools.js renamed

fixtures/devtools/webpack.config.js renamed