Add support for donation data

[Ly0n]

Donating to a project is another way to contribute to a project, so adding this information to ClimateTriage would be a good fit from my point of view. Ecosyste.ms provides all the donation information about the projects. Therefore I would like to propose to add the donation links to the projects with a ❤️ icon. To show all projects that have a donation option, we should also list them if no "Good First Issue" could be found, if this is not too hard to implement.

Another reason for this is the need for a website that lists all projects with a donation option as part of OpenClimate.fund, as discussed in the last community call.

How hard is it to implement such a feature?