Add Re-Link Button for Account.
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# Feature Request

### Description
<!-- ✍️--> A clear and concise description of the problem or missing capability...
If you change password or need to ever re-link the account, the refreshtoken needs to be removed and then you are able to re-link the account. The problem is that all of the config from the plugin is then removed and then you need to reset that back up.

### Describe the solution you'd like
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It would be nice if there was a re-link account Botton that would take you back to the login screen you can then type in your username and password and then it would pull in a new refresh token, leaving everything else in the current config as it is.

<img width="832" alt="Screen Shot 2021-07-26 at 9 20 34 AM" src="https://user-images.githubusercontent.com/9875439/127005197-be084d27-6e6d-4648-91ac-65d9ae15b7a1.png">


### Describe alternatives you've considered
<!-- ✍️--> Have you considered any alternative solutions or workarounds?

### Device data
<!-- ✍️-->  If you are requesting a new device be added to homebridge-ring, please follow the instructions in https://github.com/dgreif/ring/wiki/Data-Discovery and include the output here
