bids apps "dev" dashboard should show the status of the latest stable image instead of master

[Remi-Gau]

In light of
bids-apps/maintenance-tools#7

it seems that it maybe be more useful to have our dashboard show the status of how the latest version of an app is running rather than the status of the default branch of the repo.

We could keep those on a separate page that could more useful for us or anyone who would like to try the bleeding edge version of an app.

from bids-apps/bids-apps.github.io#107