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>

compliance-agent/src/pipeline/lint.rs

@@ -108,6 +108,7 @@ async fn run_clippy(repo_path: &Path, repo_id: &str) -> Result<Vec<Finding>, Cor
             "clippy::all",
         ])
         .current_dir(repo_path)
+        .env("RUSTC_WRAPPER", "")
         .stdout(std::process::Stdio::piped())
         .stderr(std::process::Stdio::piped())
         .spawn()

compliance-agent/src/pipeline/sbom.rs

@@ -54,6 +54,7 @@ async fn generate_lockfiles(repo_path: &Path) {
         let result = tokio::process::Command::new("cargo")
             .args(["generate-lockfile"])
             .current_dir(repo_path)
+            .env("RUSTC_WRAPPER", "")
             .output()
             .await;
         match result {
@@ -137,6 +138,7 @@ async fn enrich_cargo_licenses(repo_path: &Path, entries: &mut [SbomEntry]) {
     let output = match tokio::process::Command::new("cargo")
         .args(["metadata", "--format-version", "1"])
         .current_dir(repo_path)
+        .env("RUSTC_WRAPPER", "")
         .output()
         .await
     {
@@ -245,6 +247,7 @@ async fn run_cargo_audit(repo_path: &Path, _repo_id: &str) -> Result<Vec<AuditVu
     let output = tokio::process::Command::new("cargo")
         .args(["audit", "--json"])
         .current_dir(repo_path)
+        .env("RUSTC_WRAPPER", "")
         .output()
         .await
         .map_err(|e| CoreError::Scanner {