apparance: hinting of Cantarell seems a bit off. Switch to DejaVu Sans.

rc/apparance.lua

@@ -35,5 +35,5 @@ gtk3:close()
 
 -- For QT, the configuration file is ~/.config/Trolltech.conf. It
 -- seems a bit complex to override it each time. The solution is to
--- run qtconfig and to select "GTK+" for the style and "Cantarell 9"
--- for the font.
+-- run qtconfig and to select "GTK+" for the style and the appropriate
+-- font.

rc/theme.lua

@@ -3,7 +3,7 @@
 local theme = loadrc("../themes/nice-and-clean-theme/theme")
 if theme then
    theme.wallpaper_cmd = { "/bin/true" }
-   theme.font = "Cantarell 9"
+   theme.font = "DejaVu Sans 9"
    theme.border_width = 2
    theme.border_normal = "#00000000"
    theme.border_focus = theme.border_focus .. "66"