Scaffold Chart Sins site with Astro + build-time Vega-Lite

Set up the static-site tech stack: Astro 5 with Markdown content
collections, Vega-Lite specs rendered to static SVG at build time
(zero client JS), plain scoped CSS, and a GitHub Pages deploy workflow.

Includes three sample sins (truncated y-axis, dual-axis deception,
pie chart overload), each with a bad and fixed chart spec, plus a
gallery index and per-sin detail pages.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPEvmMbac2fCvKXpQcovj8

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "chart-sins",
+  "type": "module",
+  "version": "0.1.0",
+  "private": true,
+  "description": "A catalogue of data-visualization sins — the bad chart, the repentance, the fixed version.",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/mdx": "^4.2.0",
+    "astro": "^5.6.0",
+    "vega": "^5.30.0",
+    "vega-lite": "^5.21.0"
+  }
+}