Enhance security and localization features across the application

- Added rehype-sanitize plugin to the markdown configuration for improved security against XSS attacks.
- Updated environment variables in the codebase to include new configurations for SMTP and monitoring.
- Implemented secure headers in server and Nginx configurations to bolster security.
- Refactored email handling to prevent spoofing by ensuring safe sender addresses.
- Improved localization by updating language persistence and button components for better user experience.
- Enhanced the uptime API and contact form with better error handling and logging practices.
- Updated dependencies in package.json and package-lock.json for better performance and security.

astro.config.ts

@@ -6,6 +6,7 @@ import { defineConfig } from 'astro/config';
 import sitemap from '@astrojs/sitemap';
 import tailwind from '@astrojs/tailwind';
 import mdx from '@astrojs/mdx';
+import rehypeSanitize from 'rehype-sanitize';
 import react from '@astrojs/react';
 import partytown from '@astrojs/partytown';
 import icon from 'astro-icon';
@@ -96,7 +97,7 @@ export default defineConfig({
 
   markdown: {
     remarkPlugins: [readingTimeRemarkPlugin],
-    rehypePlugins: [responsiveTablesRehypePlugin, lazyImagesRehypePlugin],
+    rehypePlugins: [rehypeSanitize, responsiveTablesRehypePlugin, lazyImagesRehypePlugin],
   },
 
   vite: {