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remove Gittip / Gratipay badge

The project is effectively dead in the water. There's no point linking to them any longer.
senid231/activeadmin,vytenis-s/activeadmin,SoftSwiss/active_admin,chdem/activeadmin,deivid-rodriguez/activeadmin,cmunozgar/activeadmin,bcavileer/activeadmin,vraravam/activeadmin,activeadmin/activeadmin,waymondo/active_admin,ishumilova/activeadmin,mauriciopasquier/active_admin,quikly/active_admin,ishumilova/activeadmin,vraravam/activeadmin,iuriandreazza/activeadmin,iuriandreazza/activeadmin,waymondo/active_admin,mrjman/activeadmin,siutin/activeadmin,tjgrathwell/activeadmin,mateusg/active_admin,cmunozgar/activeadmin,iuriandreazza/activeadmin,whatcould/active_admin,mateusg/active_admin,bcavileer/activeadmin,bolshakov/activeadmin,siutin/activeadmin,gogovan/activeadmin,senid231/activeadmin,Ibotta/activeadmin,SoftSwiss/active_admin,activeadmin/activeadmin,bolshakov/activeadmin,wspurgin/activeadmin,siutin/activeadmin,deivid-rodriguez/activeadmin,iuriandreazza/activeadmin,maysam/activeadmin,Ibotta/activeadmin,bcavileer/activeadmin,SoftSwiss/active_admin,varyonic/activeadmin,gogovan/activeadmin,Ibotta/activeadmin,quikly/active_admin,maysam/activeadmin,chdem/activeadmin,activeadmin/activeadmin,varyonic/activeadmin,gogovan/activeadmin,halilim/activeadmin,ishumilova/activeadmin,vytenis-s/activeadmin,mauriciopasquier/active_admin,tjgrathwell/activeadmin,iuriandreazza/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,vraravam/activeadmin,bolshakov/activeadmin,chdem/activeadmin,quikly/active_admin,varyonic/activeadmin,mrjman/activeadmin,cmunozgar/activeadmin,javierjulio/activeadmin,wspurgin/activeadmin,iuriandreazza/activeadmin,halilim/activeadmin,javierjulio/activeadmin,waymondo/active_admin,maysam/activeadmin,mauriciopasquier/active_admin,vytenis-s/activeadmin,mateusg/active_admin,whatcould/active_admin,mrjman/activeadmin,senid231/activeadmin,tjgrathwell/activeadmin,wspurgin/activeadmin,whatcould/active_admin,iuriandreazza/activeadmin,halilim/activeadmin