Improve the counter of the downloads of the desktop app

[petrvecera]

Currently we have page https://coh3stats.com/desktop-app which shows amount of downloads.

However this counts only latest release from https://github.com/cohstats/coh3-stats-desktop-app/releases

We want to count downloads of all the latest releases.
We are counting it here https://github.com/cohstats/coh3-stats/blob/master/pages/desktop-app.tsx#L91

The API link looks like this
https://api.github.com/repos/cohstats/coh3-stats-desktop-app/releases
In the code we use https://api.github.com/repos/cohstats/coh3-stats-desktop-app/releases/latest
Which means that we might want to remove /latest from the code.

Now it will return array of objects instead of single object.

Implementation:

1. We need to have the latest release and properly set the download link
2. We want to count downloads from all the old assets too
   • Keep in mind that we need to filter assets which are .sig as we have in the code.

If you have any questions feel free to ask.