Consider pointing to releases page on Linux instead of tarball

While linking directly to a tarball is useful for users that use a directly extracted copy of VSCodium, for AppImage users being redirected to an archive when expecting a new AppImage is a confusing and frustrating experience.

Additionally, for users who use either Flatpak or their distribution's package manager, the experience is equally as confusing - potentially on these platforms could the update check either be disabled or the link replaced with a hint to update via their package manager?

Both of these potential issues could be resolved by linking directly to the Releases page, as every option of distribution is readily available, and the release notes could contain a reminder of how to update via a package manager.

I hope the reasoning behind this proposal makes sense, and I am eager to hear your opinions.

Start by locating the update service logic in this repository and reviewing how its version JSON files provide update links. Confirm whether the intended outcome is always linking to the VSCodium Releases page or handling AppImage, Flatpak, and package-manager users differently; done means the chosen behavior is implemented and verified for those distribution paths.