message: Update DevTools.tsx | Add -D flag to install cmd
  Added the `-D` flag to the installation command so users can streamline copy-pasting the command without needing to remember to add the flag when running the command.
diff: @@ -86,11 +86,11 @@ export default ({ defaultLang, content }: Props) => {
  lightMode ? getStartedStyle.lightInstallCode : ""
  }`}
  >
  - npm install @hookform/devtools
  + npm install -D @hookform/devtools
  <button
  className={getStartedStyle.copyButton}
  onClick={() => {
  - copyClipBoard("npm install @hookform/devtools")
  + copyClipBoard("npm install -D @hookform/devtools")
  alert(generic.copied["en"])
  }}
  >
  