update: insert donation links based on FUNDING.yml
GitHub has specified FUNDING.yml, a file to include in a git repo for pointing people to donation links. Since F-Droid also points people to donation links, this parses them to fill out
OpenCollective:. Specifying those in the metadata file takes precedence over the FUNDING.yml. This follows the same pattern as how
fdroid update includes Fastlane/Triple-T metadata. This lets the git repo maintain those specific donations links themselves.