Initial Hugo gallery site with custom landing page

- Hugo site with nicokaiser/hugo-theme-gallery (git submodule)
- Full-viewport hero with parallax scrolling (bg at 70%, text at 85% speed)
- Entrance animations on hero title and subtitle
- Bouncing scroll arrow that fades out on scroll
- Header suppressed on homepage, shown on all other pages
- Intro text section between hero and album grid
- Cats placeholder album with 8 images
- .gitignore excludes public/, resources/, .hugo_build.lock, .idea/

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

.gitignore

@@ -0,0 +1,4 @@
+public/
+resources/
+.hugo_build.lock
+.idea/