chore: clean up root folder by moving config files

- Move renovate.json to .github/renovate.json
- Move electron-builder.yml to electron/electron-builder.yml
- Move electron.d.ts to electron/electron.d.ts
- Delete proxy.ts (unused dead code)
- Update package.json dist scripts with --config flag
- Use tsconfig.json files array for electron.d.ts (bypasses exclude)

Reduces git-tracked root files from 23 to 19.

tsconfig.json

@@ -22,6 +22,7 @@
             "@/*": ["./*"]
         }
     },
+    "files": ["electron/electron.d.ts"],
     "include": [
         "next-env.d.ts",
         "**/*.ts",