[Feature] Privacy policy and terms of service point to local addresses

[EtaoinWu]

Hello the brilliant developers of Donetick.

Currently the login/registration pages link to the official website for both terms of service and privacy policy; see here in LoginView.jsx:

<Button
  variant='plain'
  size='sm'
  onClick={() => {
    window.open('https://donetick.com/privacy', '_blank')
  }}
>
  Privacy Policy
</Button>
<Button
  variant='plain'
  size='sm'
  onClick={() => {
    window.open('https://donetick.com/terms', '_blank')
  }}
>
  Terms of Use
</Button>

It would be nice if these point to /privacy and /terms of the self-hosted instance instead of the hard-coded official website.