Replace fallback Tor Browser images
Since time immemorial the applications team have been using this image as a fallback for Tor Browser related posts that don't have a dedicated image.
I was wondering if we can replace this with three images going forward:
- For general posts not related to a specific release, use this generic graphic: tor-browser-stable
- For subsequent releases in the 13.0 series, use this graphic: tor-browser-13
- For alpha release posts, use this new dedicated alpha graphic: tor-browser-alpha
