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/features/overview.md

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+# Dashboard Overview
+
+The Overview page is the landing page of the Compliance Scanner dashboard. It gives you a high-level view of your security posture across all tracked repositories.
+
+## Statistics
+
+The top section displays key metrics:
+
+| Metric | Description |
+|--------|-------------|
+| **Repositories** | Total number of tracked repositories |
+| **Total Findings** | Combined count of all security findings |
+| **Critical** | Findings with critical severity |
+| **High** | Findings with high severity |
+| **Medium** | Findings with medium severity |
+| **Low** | Findings with low severity |
+| **Dependencies** | Total SBOM entries across all repositories |
+| **CVE Alerts** | Active CVE alerts from dependency monitoring |
+| **Tracker Issues** | Issues created in external trackers (GitHub, GitLab, Jira) |
+
+## Severity Distribution
+
+A visual bar chart shows the distribution of findings by severity level, giving you an immediate sense of your risk profile.
+
+## Recent Scan Runs
+
+The bottom section lists the 10 most recent scan runs across all repositories, showing:
+
+- Repository name
+- Scan status (queued, running, completed, failed)
+- Current phase
+- Number of findings discovered
+- Timestamp
+
+This helps you monitor scanning activity and quickly spot failures.