relax websocket rate limits

What does this PR do?

We have just deployed the websocket rate limits to https://dev.joinsharkey.org/ and we can easily hit them with normal usage, so we need to relax them.

• the frontend opens 2 websockets at startup (I'm not completely clear why), and that minInterval:1sec was breaking the second connection
• as the comment says, "catching up" generates many noteSubscribe messages

Not really tested, because I'm once again making up numbers. Finding a decent middle ground between "nobody can use the site" and "anyone can crash the site" is not that easy!

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