added yay fzf style installation and removal, minor changes to scripts

.config/vifm/vifmrc

@@ -193,6 +193,11 @@ filextype *.djvu
         \ {View in apvlv}
         \ apvlv %f,
 
+" epub
+filextype *.epub
+        \ {View in zathura}
+        \ zathura %f,
+
 " Audio
 filetype *.wav,*.mp3,*.flac,*.m4a,*.wma,*.ape,*.ac3,*.og[agx],*.spx,*.opus
        \ {Play using ffplay}