Allow fuzzel.ini to be customized

Instead of overwriting the entire fuzzel.ini on each theme change. Theme
changes are made to fuzzel.theme which is then imported by fuzzel.ini

Rationale:
I like to use vim binds for fuzzel and there wasn't a good way to modify
fuzzel.ini without making the end-4 update process complicated.

.config/fuzzel/fuzzel.ini

@@ -1,18 +1,9 @@
+include="~/.cache/ags/user/generated/fuzzel/fuzzel.theme"
 font=Gabarito
 terminal=foot -e
 prompt=">>  "
 layer=overlay
 
-[colors]
-background=1D1011ff
-text=F7DCDEff
-selection=574144ff
-selection-text=DEBFC2ff
-border=574144dd
-match=FFB2BCff
-selection-match=FFB2BCff
-
-
 [border]
 radius=17
 width=1