feat(config, layout, components): enhance security headers, improve SEO, and update project descriptions

- Added security headers in the Next.js configuration to enhance application security.
- Updated metadata in the layout component for improved SEO, including new titles, descriptions, and keywords.
- Introduced JSON-LD schema for projects to enhance search engine visibility.
- Enhanced project descriptions in the portfolio data for clarity and detail.
- Improved header component with logo integration and refined social media links for better accessibility.

app/sitemap.ts

@@ -0,0 +1,45 @@
+import { MetadataRoute } from 'next'
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const baseUrl = 'https://evandro.dev.br'
+  const currentDate = new Date().toISOString()
+
+  return [
+    {
+      url: baseUrl,
+      lastModified: currentDate,
+      changeFrequency: 'monthly',
+      priority: 1.0,
+    },
+    {
+      url: `${baseUrl}/#about`,
+      lastModified: currentDate,
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+    {
+      url: `${baseUrl}/#skills`,
+      lastModified: currentDate,
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+    {
+      url: `${baseUrl}/#experience`,
+      lastModified: currentDate,
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+    {
+      url: `${baseUrl}/#projects`,
+      lastModified: currentDate,
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+    {
+      url: `${baseUrl}/#contact`,
+      lastModified: currentDate,
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+  ]
+}