Add headings from within block groups to in-page navigation #13
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Previously, only headings in the root of the page were found
This update recurses into block groups to find headings there
Specifically, this is wanted for lambethtogether.net -- E.g. https://lambethtogether.net/long-read/nwda-report/thriving-communities/ should have the 'Context and key challenges' in the in-page navigation
To test, copy the above long-read or create a long read and group blocks with a heading included
Resolves: https://dxw.zendesk.com/agent/tickets/17292 / https://dxw.zendesk.com/agent/tickets/17261
Due to the nature of the dependencies for the changes, it is included in one commit. Technically this implements: