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>

html/img/system-integration.svg

@@ -0,0 +1,9 @@
+<svg 
+    xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" 
+    stroke="rgb(37 99 235 / var(--tw-text-opacity, 1))" 
+    stroke-width="2" 
+    stroke-linecap="round" 
+    stroke-linejoin="round"
+>
+    <path d="M15.39 4.39a1 1 0 0 0 1.68-.474 2.5 2.5 0 1 1 3.014 3.015 1 1 0 0 0-.474 1.68l1.683 1.682a2.414 2.414 0 0 1 0 3.414L19.61 15.39a1 1 0 0 1-1.68-.474 2.5 2.5 0 1 0-3.014 3.015 1 1 0 0 1 .474 1.68l-1.683 1.682a2.414 2.414 0 0 1-3.414 0L8.61 19.61a1 1 0 0 0-1.68.474 2.5 2.5 0 1 1-3.014-3.015 1 1 0 0 0 .474-1.68l-1.683-1.682a2.414 2.414 0 0 1 0-3.414L4.39 8.61a1 1 0 0 1 1.68.474 2.5 2.5 0 1 0 3.014-3.015 1 1 0 0 1-.474-1.68l1.683-1.682a2.414 2.414 0 0 1 3.414 0z"/>
+</svg>