Nodeinfo explorer always fails, because of CSP

Error shown in browser console:

```
Refused to connect to 'https://mastodon.me.uk/.well-known/nodeinfo' because it violates the following Content Security Policy directive: "connect-src 'self' https://api.fedidb.org https://*.fedidb.org".
```

Using Vivaldi on macOS, but I think this will affect any browser combo.