Remove legacy apps with ports

### Problem

There are some legacy apps which have been ported, but using a new RDNN. There are also some that were abandoned, but forked and submitted under new branding.

It would be helpful to not show those under the legacy apps section to more accurately reflect what's missing from the Flatpak store

### Proposal

@cassidyjames recommended that we might check for a tag somewhere where developers can say their app provides/supersedes some other RDNN

We might also want some kind of ignore list

### Prior Art (Optional)

_No response_