(bugfix) remove maintaining gentoo-wiki which has been removed
(bugfix) remove maintaining gentoo-wiki which has been removed

gentoo-wiki is no longer supported directly and removed from
family folder

Change-Id: If30313977033aca986e955425ea4b244aa6b8206

icyflame/batman,happy5214/pywikibot-core,smalyshev/pywikibot-core,trishnaguha/pywikibot-core,npdoty/pywikibot,npdoty/pywikibot,jayvdb/pywikibot-core,xZise/pywikibot-core,PersianWikipedia/pywikibot-core,magul/pywikibot-core,wikimedia/pywikibot-core,happy5214/pywikibot-core,jayvdb/pywikibot-core,magul/pywikibot-core,Darkdadaah/pywikibot-core,hasteur/g13bot_tools_new,emijrp/pywikibot-core,wikimedia/pywikibot-core,darthbhyrava/pywikibot-local,valhallasw/pywikibot-core,h4ck3rm1k3/pywikibot-core,Darkdadaah/pywikibot-core,VcamX/pywikibot-core,hasteur/g13bot_tools_new,hasteur/g13bot_tools_new,TridevGuha/pywikibot-core,h4ck3rm1k3/pywikibot-core