Nested project pages should (be able to) have hierarchical URLs

[greatislander]

Is your feature request related to a problem? Please describe.

Currently one can have a project page with a subpage. E.g. "My Project" and "My Project Reports". Right now, this would lead to URLs as follows:

• /projects/my-project/
• /projects/my-project-reports/

Describe the solution you'd like

Ideally, nested projects and subpages could have hierarchical URLs generated automatically, e.g.:

• /projects/my-project/
• /projects/my-project/reports/

Describe alternatives you've considered

Users can currently enter a custom URL for all project pages and subpages but it would be great to support this without requiring user input (other than specifying the page hierarchy).

Additional context

See changes related to parent/child project pages here: chosww#2