Add Contact Page and Update Navigation Links

- Updated navigation links across multiple blog pages to replace "Index" with "Home" and added "Contact" link.
- Created a new contact page with a form for user inquiries.
- Added a new contact template to render the contact page content.
- Updated blog index page to enhance structure and styling.
- Added a contact markdown file for content management.

templates/base.html

@@ -20,6 +20,8 @@
       {{ template "blog_post_content" . }}
     {{- else if eq .PageTemplate "category_page" -}}
       {{ template "category_content" . }}
+    {{- else if eq .PageTemplate "contact_page" -}}
+      {{ template "contact_content" . }}
     {{- else -}}
       <p>Unknown PageTemplate: {{ .PageTemplate }}</p>
     {{- end -}}