Organized all script files

Removed useless things from all files
Added an update notification if there is an update
Updated the directory for the app icon

scripts/preload.js

@@ -0,0 +1,12 @@
+const { contextBridge, ipcRenderer } = require('electron');
+
+contextBridge.exposeInMainWorld('api', {
+
+  getFavorites: () => ipcRenderer.invoke('db:getFavorites'),
+  addFavorite: (fav) => ipcRenderer.invoke('db:addFavorite', fav),
+  removeFavorite: (id) => ipcRenderer.invoke('db:removeFavorite', id),
+
+  search: (source, query) => ipcRenderer.invoke('api:search', source, query),
+
+  getSources: () => ipcRenderer.invoke('api:getSources'),
+});