Rewind draft tutorial

[Srushtika]

No description provided.

[tomczoink]

Few points, otherwise nicely done

[SimonWoolf]

If you want to include a channel name with params in the name, you need to uri-encode it, which you're not doing here. A much easier way is just to add rewind=1 as another url param. This is explained in the documentation pr:
https://github.com/ably/docs/pull/729/files#diff-7b572e68f8441588d6eacc180bc8f989R76-R89

[SimonWoolf]

(to explain this a bit further: the reason this is especially necessary here is that question marks have special meaning in urls, they start the query string ("/sse?v=..."). Maybe in some browsers having subsequent question marks inside the query string will work, but it's not guaranteed to work in all of them. The correct/safe thing to do that will work in all browsers is uri-encode them. (Really this should be done for all api streamer sse examples -- the brackets and forwardslash in [product:foo/bar]baz are technically also disallowed, though again, will probably work in some browsers))