refactor: Clean up CSS structure and separate print.css

- Delete orphaned CSS files (color-theme.css, logo-toggle.css,
  skeleton.css, main.new.css) - replaced by modular equivalents
- Delete 08-contexts/_print.css - wrongly created during modularization
- Remove 08-contexts folder (now empty)
- Add print.css as standalone with media="print" in HTML
- Update stale comments referencing old file names
- Remove _print.css import from main.css

print.css remains standalone and will NOT be bundled, as it's a
special case loaded only when printing (media="print").

static/css/03-components/_cv-section.css

@@ -95,7 +95,7 @@
 }
 
 /* Experience */
-/* Experience item layout moved to logo-toggle.css */
+/* Experience item layout moved to _toggles.css */
 
 .experience-header {
     margin-bottom: 0.6rem;