Add banner alerting users to Google developer verification scheme and how it impacts F-Droid.
This is as discussed at FOSDEM with various contributors and board members, as well collaboration with the IzzyOnDroid team. We agreed to display a banner at the top of the website (and also the client, I am working on a MR for that too) alerting users to the problem with Google's developer verification scheme. It will not try to explain the specific problem in detail, but rather nudge them to keepandroidopen.org (run by @marcprux).
Hopefully this can be removed (i.e. Google backs down). If not, we can discuss once it is live how long we want it to be here. It doesn't necessarily need to be a permanent fixture on the website.
Clicking the X will dismiss the banner.
I've tried to respect those with JS disabled by not offering a dismiss button unless you have JS enabled (in which case we remember via localStorage, and don't show again). However, I realise that this will end up nagging those users more. If this is a sever issue, let me know and I can go further to allow those people to also dismiss without JS, but that will not persist across reloads (e.g. https://codepen.io/paulodetarsofm/pen/mddeprm).
Note this same banner styles can also be used in the future for other tasks. For example, not just danger red ones, but also fundraising campaigns, as one example.


