Add VitePress documentation site with complete user guides

Covers getting started, repositories, scanning, findings, configuration,
SBOM, code graph, impact analysis, DAST, AI chat, issue tracker integration,
Docker deployment, environment variables, Keycloak auth, and OpenTelemetry.

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

docs/.vitepress/config.mts

@@ -0,0 +1,55 @@
+import { defineConfig } from 'vitepress'
+
+export default defineConfig({
+  title: 'Compliance Scanner',
+  description: 'AI-powered security compliance scanning platform',
+  ignoreDeadLinks: [
+    /localhost/,
+  ],
+  themeConfig: {
+    nav: [
+      { text: 'Guide', link: '/guide/getting-started' },
+      { text: 'Features', link: '/features/overview' },
+      { text: 'Deployment', link: '/deployment/docker' },
+    ],
+    sidebar: [
+      {
+        text: 'Guide',
+        items: [
+          { text: 'Getting Started', link: '/guide/getting-started' },
+          { text: 'Adding Repositories', link: '/guide/repositories' },
+          { text: 'Running Scans', link: '/guide/scanning' },
+          { text: 'Managing Findings', link: '/guide/findings' },
+          { text: 'Configuration', link: '/guide/configuration' },
+        ],
+      },
+      {
+        text: 'Features',
+        items: [
+          { text: 'Dashboard Overview', link: '/features/overview' },
+          { text: 'SBOM & License Compliance', link: '/features/sbom' },
+          { text: 'Code Knowledge Graph', link: '/features/graph' },
+          { text: 'Impact Analysis', link: '/features/impact-analysis' },
+          { text: 'DAST Scanning', link: '/features/dast' },
+          { text: 'AI Chat (RAG)', link: '/features/ai-chat' },
+          { text: 'Issue Tracker Integration', link: '/features/issues' },
+        ],
+      },
+      {
+        text: 'Deployment',
+        items: [
+          { text: 'Docker Compose', link: '/deployment/docker' },
+          { text: 'Environment Variables', link: '/deployment/environment' },
+          { text: 'Keycloak Authentication', link: '/deployment/keycloak' },
+          { text: 'OpenTelemetry', link: '/deployment/opentelemetry' },
+        ],
+      },
+    ],
+    socialLinks: [
+      { icon: 'github', link: 'https://gitea.meghsakha.com/sharang/compliance-scanner-agent' },
+    ],
+    footer: {
+      message: 'Compliance Scanner Documentation',
+    },
+  },
+})