Update UI element size and change directory exclusion rule

This commit modifies the size of sun and moon icons in the mode-toggle UI and simplifies the space usage of a flex container in the site header. Furthermore, it updates the path pattern for the directory exclusion rule in tailwind configuration to exclude node_module from all directories.

tooling/tailwind/index.ts

@@ -6,7 +6,7 @@ export default {
   content: [
     '../../packages/**/*.tsx',
     '../../apps/**/*.tsx',
-    '!./**/node_modules/**',
+    '!**/node_modules',
   ],
   theme: {
     container: {