silent failure mode when osm-teams api is down

If osm-teams api is down, the app behaves badly when it tries to connect.

Teams page appearance when rendered server-side

Teams page appearance when rendered client-side. It's kind of beside the point but these should not render differently (relates to #511)

Partial stack trace from next.js

```
error: Error: connect ECONNREFUSED 127.0.0.1:8989
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1134:16) {
errno: 'ECONNREFUSED',
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 8989
},
options: {
uri: 'http://localhost:8989/api/teams?osmId=10499924',
callback: [Function: RP$callback],
transform: undefined,
simple: true,
resolveWithFullResponse: false,
transform2xxOnly: false
},
```
Recommendation:

Display a toast or error dialog saying osm-teams could not be reached. This would enable at the minimum an admin to troubleshoot it (or communicate it to the devs).