docs(web-dashboard): rename theming guide and update navigation

- Rename 'Theming & Customization' to 'Styling & Theming'
- Update navigation label and file name in astro.config.mjs
- Modify title and description in Markdown file

Author: fulleni

astro.config.mjs

@@ -121,7 +121,7 @@ export default defineConfig({
 							label: 'Guides',
 							collapsed: true,
 							items: [
-								{ label: 'Theming & Customization', link: '/web-dashboard/guides/theming-and-customization' },
+								{ label: 'Styling & Theming', link: '/web-dashboard/guides/styling-and-theming' },
 								{ label: 'Localization', link: '/web-dashboard/guides/localization' },
 							],
 						},

src/content/docs/web-dashboard/guides/theming-and-customization.mdx renamed to src/content/docs/web-dashboard/guides/styling-and-theming.mdx

@@ -1,6 +1,6 @@
 ---
-title: 'Guide: Theming & Customization'
-description: A developer's guide to customizing the visual appearance of the web dashboard.
+title: 'Guide: Styling & Theming'
+description: Learn how to customize the application's visual appearance.
 ---
 import { Aside } from '@astrojs/starlight/components';