add vencord themes watcher

src/main/constants.ts

@@ -11,6 +11,7 @@ export const DATA_DIR = process.env.VENCORD_USER_DATA_DIR || join(app.getPath("u
 export const VENCORD_SETTINGS_DIR = join(DATA_DIR, "settings");
 export const VENCORD_QUICKCSS_FILE = join(VENCORD_SETTINGS_DIR, "quickCss.css");
 export const VENCORD_SETTINGS_FILE = join(VENCORD_SETTINGS_DIR, "settings.json");
+export const VENCORD_THEMES_DIR = join(DATA_DIR, "themes");
 
 // needs to be inline require because of circular dependency
 // as otherwise "DATA_DIR" (which is used by ./settings) will be uninitialised