[Feature Request] Reduce stale plugin descriptions

I've just gone through the plugin repository to pick the plugins I'd like, and I almost missed one due to a stale description.

To install OctoPrint-SlicerSettingsTab, I need OctoPrint-SlicerSettingsParser. The description says it's only compatible with two slicers. I use Cura, not listed, so I almost didn't install this. I checked GitHub, just in case, and the description states that it now does support Cura, though an additional step is required. It's reasonable to assume a lot of Cura users would have passed this plugin by due to this stale description.

When a plugin is on GitHub, it would be useful to generate the description by copying it from GitHub during a periodic (daily?) refresh/check for updates (appreciate that not all are on GitHub, though all the ones I've looked at have been) to automatically keep the OctoPrint Plugins data up to date.

The issue names no files, tests, or existing refresh entry point. Start by tracing how plugin descriptions are sourced and updated, then examine the proposed periodic GitHub refresh and its handling of plugins that are not hosted on GitHub. Done means stale descriptions are updated without breaking unsupported sources.