Add show/hide password toggle on login

[anoopcodehack]

File: client/src/pages/Login.jsx

The password field has no 👁️ button.
Add a toggle to show/hide password.

Fix:
const [show, setShow] = useState(false)
type={show ? "text" : "password"}
Add a 👁️ button next to the input.
~5 lines!