Prominently add liberapay link on GitHub (#2581)
Prominently add liberapay link on GitHub (#2581)

Fixes <https://github.com/FreshRSS/FreshRSS/issues/2580>.
aledeg/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,romibi/FreshRSS,aledeg/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,marienfressinaud/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,marienfressinaud/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS