fix: Correct YAML syntax for sitemap configuration

- Fixed TOML syntax mixed with YAML front matter
- Changed [sitemap] to sitemap: for proper YAML
- Fixed quotes and equals signs to YAML format
- Should resolve Hugo build error

Author: Debdyut

portfolio/content/_index.md

@@ -2,9 +2,9 @@
 title: "Portfolio"
 date: 2024-10-31T16:47:00+05:30
 draft: false
-[sitemap]
-  changefreq = 'weekly'
-  priority = 1.0
+sitemap:
+  changefreq: weekly
+  priority: 1.0
 ---
 
 # Debdyut Hajra

portfolio/content/projects/_index.md

@@ -2,9 +2,9 @@
 title: "Projects"
 draft: false
 description: Technical projects spanning payments, cloud infrastructure, and embedded systems
-[sitemap]
-  changefreq = 'weekly'
-  priority = 0.9
+sitemap:
+  changefreq: weekly
+  priority: 0.9
 outputs:
 - HTML
 - JSON