Setup frontend — fonts, SCSS structure, header scroll animation

- Add Bartok font-faces (Regular, Poster, Highlight)
- Structure SCSS with reset, variables, global, header, home partials
- Build fixed header with characters SVG and scroll-driven offset animation
- Add home template wiring snippets
- Update .gitignore to track src/ and exclude local/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

site/templates/home.php

@@ -0,0 +1,3 @@
+<?php snippet('head') ?>
+<?php snippet('header') ?>
+<?php snippet('footer') ?>