Fix big grid crashing due to missing React import

by fixing the cause rather than the symptom: this upgrades the code to use the new, recommended JSX transform mode of React 17+, which no longer requires you to import React manually just to write JSX.

src/button/Button.tsx

@@ -13,7 +13,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-import React, { forwardRef, useCallback } from "react";
+import { forwardRef, useCallback } from "react";
 import { PressEvent } from "@react-types/shared";
 import classNames from "classnames";
 import { useButton } from "@react-aria/button";

src/button/CopyButton.tsx

@@ -14,7 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React from "react";
 import { useTranslation } from "react-i18next";
 import useClipboard from "react-use-clipboard";
 

src/button/LinkButton.tsx

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, { HTMLAttributes } from "react";
+import { HTMLAttributes } from "react";
 import { Link } from "react-router-dom";
 import classNames from "classnames";
 import * as H from "history";

src/button/VolumeIcon.tsx

@@ -15,8 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React from "react";
-
 import { ReactComponent as AudioMuted } from "../icons/AudioMuted.svg";
 import { ReactComponent as AudioLow } from "../icons/AudioLow.svg";
 import { ReactComponent as Audio } from "../icons/Audio.svg";