(Feature request) Friendly share urls: turn title into shareAlias

[maphew]

Describe feature

Idea: a script with button/keystroke for "turn note title into share-alias". Also make it apply when changing a note's status to Shared, but it only acts if #shareAlias is missing/empty. In case of duplicate append something.

Changing the friendly URL should not be done automatically by the system, because the user might not be aware that changing the title will also affect the URL. Generally once a page is published it's a good idea to keep the URL the same in order not to break any hard links (inside the application, or bookmarked by viewers of the site).

The shareAlias would continue to be able to be changed by a deliberate act by the user, the same way it is now (which could be the user executing the putative titleToShareAlias function).

Originally posted by @maphew in TriliumNext/Docs#117 (comment)