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>

.gitignore

@@ -61,8 +61,6 @@ content/*
 
 # CSS
 # ---------------
-assets/css/src
-assets/css/src/*
 assets/css/style.css
 assets/css/style.css.map
 
@@ -72,3 +70,8 @@ kirby
 kirby/*
 vendor
 vendor/*
+
+# Local files
+# ---------------
+local
+local/*