Add new templates and tests for improved functionality

- Created index.html template for the homepage with service cards and partner logos.
- Added page_from_md.html template for rendering pages from markdown.
- Developed services.html template detailing various services offered.
- Implemented tests for link handling in markdown, ensuring external links open in new tabs and internal links function correctly.
- Enhanced markdown parser tests to validate heading extraction, content rendering, and link safety.
- Introduced utility tests for template rendering, HTML minification, and JavaScript minification.

Co-authored-by: Copilot <copilot@github.com>

templates/_base.html

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en">
+  {% include "_head.html" %}
+  <body>
+    {% include "_header.html" %}
+    <div id="main-content">
+      <div id="main">
+         {% block content %}{% endblock %} {%include
+        "_footer.html" %}
+      </div>
+    </div>
+    {% block scripts %}
+    <script src="js/nav.js" defer></script>
+    {% endblock %}
+    <script src="js/partner.js" defer></script>
+  </body>
+</html>