Thanks for the nudge! We’ve just added search - there’s now a Search the documentation field at the top of https://docs.snapcraft.io pages, although there will likely be further refinements.
The broken links have been fixed in the updated Build configuration reference material, but I need to go back and make the same changes to Snapcraft.yaml schema as I really don’t want to remove an easily searchable single page.
I’ll look into adding something on filesets.