bakery.toml: bread-theme + awww/pywal, not bread

The setter shells out to awww, wal, and bread-theme reload. It never
talks to breadd. bakery.toml listed bread as a dep and treated awww as
optional.

Add a short README: this is a setter, not a library or slideshow
daemon. Wallpaper library UI lives in bos-settings.

bakery.toml

@@ -1,9 +1,9 @@
 name = "breadpaper"
 description = "Wallpaper manager for the bread desktop — sets awww wallpaper, generates pywal palette, reloads bread themes"
 binaries = ["breadpaper"]
-system_deps = ["python-pywal"]
-optional_system_deps = ["awww"]
-bread_deps = ["bread"]
+system_deps = ["awww", "python-pywal"]
+optional_system_deps = []
+bread_deps = ["bread-theme"]
 license_file = "LICENSE"
 
 [install]