Improve client token usability

Minor suggestions for improving the token user experience.

The token overview page kindly shows a helpful configuration config.ini snippet with all the right data already populated, but as we hardened token issuance there no longer is a way to display existing tokens, so I cannot actually use that snippet on that page. Then when I create a new token and the token actually is retrievable, the config.ini snippet goes missing. Would it be possible to add or move it there?

After creating a token, the token is hidden by default. This is a good security measure. The typical interaction then is to show it and copy it. Would it be possible to have another button that copies the token to the clipboard without even displaying it? This likely requires using the javascript clipboard api.

These two changes would simplify the typical end user interaction. If you disagree, please don't hesitate to change the description or close this issue.