Slight change to the new custom disconnect message

[JT-39]

Is your feature request related to a problem? Please describe.

Thanks for updating the custom disconnect message function with the ability to add a different email and a specific link. But in my head I was thinking these would also be able to added as additional options (as well as replacements).

So,

1. I could point towards explore.statistics@education.gov.uk and another email (although this may be confusing? maybe it is best to just have one?).
2. I can have the refresh link and a separate "Reset page" or "Back to default" link (aka the initial view) - gives users choice so that if they want to return to their original selections they can (especially with the timeout being quick), but if this causes a continuous error then they can definitely get back to a working app link.
3. The default Posit reload pop-up is still appearing (see below image) - I feel like this didn't used to appear, as it looks a little clunky (personal preference -not sure if we can hide it).

Describe the solution you'd like

• Potentially allow for multiple email addresses. #79
• Allow both refresh page and reload dashboard in custom disconnect #80
• Hide the default Posit reload pop-up #81

[cjrace]

I think we'd want to keep it to a single email address so it's simpler for users, they just have one contact point to go to. The other two should be possible though - have made them into separate issues so they can be done in separate PRs if easier. The default posit thing really shouldn't be showing, it never used to as we hid it, so that's a bug we've introduced at some point!

[cjrace]

In fact, I'm going to close this in favour of the other two issues I copied info into to avoid confusion / duplication.