Change the structs URIs to reflect the new format

Jessica Tallonrequested to merge
update-structs-urls into master

This changes the machine URIs to be:

ocapn://address.[hints].transport

and for sturdyrefs to be:

ocapn://address.[hints].transport/s/swiss-num

Hints might want to be moved to somewhere else, for example the query part of the URI, although that should be discussed further and happen in a future PR.

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