I know this is a non-trivial request, and may or may not already be part of the goal for this project, but I thought I'd open this as an issue to have a proper place for it.
Essentially, if this page is going to partly replace what octave-forge was used for (in terms of acting as a repository of packages), it would be useful to be able to search "inside" packages, for the presence (and possibly documentation) of provided functions.
One way this could be achieved is if package maintainers were asked to provide a list of provided functions (preferably with a link to documentation) with their packages, that could then be searched from the main search interface.