Initial commit: CRDC Arrests API demo app

React + Vite static site demonstrating the CRDC School Arrest Rate API.
Features 6 interactive charts comparing observed arrest data against Bayesian
model estimates across U.S. school districts, with Civilytics visual identity.

- State selector and district search with 'interesting' suggestions (top arrests)
- Animated histogram loading grid showing posterior draw progress
- Charts: time series, rate by group, district vs national, model comparison quadrants, density proxy, exceedance probability
- Static JSON fixture for national rates (no API changes needed)
- Dockerfile + docker-compose.yml for self-hosted deployment
- GitHub Actions workflow and _config.yml for Git Pages

_config.yml

@@ -0,0 +1,29 @@
+# Git Pages (Jekyll) configuration — for self-hosted static site deployment.
+# Matches the civilytics.org hosting setup where you have a GitHub/GitLab Pages equivalent.
+
+title: CRDC Arrests API Demo
+description: "Explore school-based arrest rates by U.S. district with Bayesian model comparisons."
+author: Civilytics Consulting LLC
+
+# Exclude non-essential files from Jekyll processing
+exclude:
+  - node_modules
+  - .git
+  - .github
+  - Dockerfile
+  - docker-compose.yml
+  - src
+  - package.json
+  - package-lock.json
+  - vite.config.js
+  - eslint.config.*
+
+# Keep the static build output as-is (no Jekyll processing of JS/CSS)
+keep_files:
+  - dist/
+
+# Markdown settings for any docs pages
+markdown: kramdown
+kramdown:
+  syntax_highlighter_opts:
+    blockquote_plain_markdown: true