Remove compiled.css from repository

The compiled CSS is a build artifact that should be generated during
CI and deployment, not tracked in version control. This eliminates
merge conflicts and repository bloat from the 5,900-line generated file.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hsbt

.gitignore

@@ -9,5 +9,6 @@ vendor
 bin
 .jekyll*
 node_modules/
+stylesheets/compiled.css
 _figma/
 _svg-backup/