docs: rewrite user docs, fix modal scroll, webhook URL, and sccache

Rewrite all public documentation to be user-facing only:
- Remove deployment, configuration, and self-hosting sections
- Add guide pages for SBOM, issues, webhooks & PR reviews
- Add reference pages for glossary and tools/scanners
- Add 12 screenshots from live dashboard
- Explain MCP, LLM triage, false positives, human-in-the-loop

Fix edit repository modal not scrollable (max-height + overflow-y).
Show full webhook URL using window.location.origin instead of path.
Unset RUSTC_WRAPPER in agent cargo commands to avoid sccache errors.

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

docs/features/overview.md

@@ -1,10 +1,12 @@
 # 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.
+The Overview page is the landing page of Certifai. It gives you a high-level view of your security posture across all tracked repositories.
 
-## Statistics
+![Dashboard overview with stats cards, severity distribution, AI chat, and MCP servers](/screenshots/dashboard-overview.png)
 
-The top section displays key metrics:
+## Stats Cards
+
+The top section displays key metrics at a glance:
 
 | Metric | Description |
 |--------|-------------|
@@ -14,22 +16,32 @@ The top section displays key metrics:
 | **High** | Findings with high severity |
 | **Medium** | Findings with medium severity |
 | **Low** | Findings with low severity |
-| **Dependencies** | Total SBOM entries across all repositories |
+| **Dependencies** | Total SBOM packages across all repositories |
 | **CVE Alerts** | Active CVE alerts from dependency monitoring |
-| **Tracker Issues** | Issues created in external trackers (GitHub, GitLab, Jira) |
+| **Tracker Issues** | Issues created in external trackers (GitHub, GitLab, Gitea, Jira) |
+
+These cards update after each scan completes, so you always see the current state.
 
 ## Severity Distribution
 
-A visual bar chart shows the distribution of findings by severity level, giving you an immediate sense of your risk profile.
+A visual chart shows the distribution of findings by severity level across all your repositories. This gives you an immediate sense of your risk profile -- whether your findings are mostly informational or if there are critical issues that need attention.
+
+## AI Chat Cards
+
+The overview includes quick-access cards for the AI Chat feature. Each card represents a repository that has embeddings built, letting you jump directly into a conversation about that codebase. See [AI Chat](/features/ai-chat) for details.
+
+## MCP Server Cards
+
+If you have MCP servers registered, they appear on the overview page with their status and connection details. This lets you quickly check that your MCP integrations are running. See [MCP Integration](/features/mcp-server) for details.
 
 ## Recent Scan Runs
 
-The bottom section lists the 10 most recent scan runs across all repositories, showing:
+The bottom section lists the most recent scan runs across all repositories, showing:
 
 - Repository name
 - Scan status (queued, running, completed, failed)
 - Current phase
 - Number of findings discovered
-- Timestamp
+- Timestamp and duration
 
-This helps you monitor scanning activity and quickly spot failures.
+This helps you monitor scanning activity and quickly spot failures or long-running scans.