fix: restore kube-system for sealed-secrets-controller refs

Reverts docs changes from 143b2c3 that incorrectly replaced
kube-system with headlamp for sealed-secrets-controller commands.

The sealed-secrets-controller runs in kube-system, NOT headlamp.
Only the Headlamp app install namespace was changed to headlamp.

Changes:
- Revert -n headlamp → -n kube-system in all sealed-secrets-controller
  kubectl commands across all docs files
- Revert sealed-secrets-controller.kube-system DNS reference
- Revert --controller-namespace=headlamp → --controller-namespace=kube-system
- Revert 'namespace headlamp' → 'namespace kube-system' in error messages

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.markdownlint-cli2.jsonc

@@ -1,53 +0,0 @@
-{
-  "config": {
-    // Line length — not enforced for docs with code examples
-    "MD013": false,
-    // First line heading — files use YAML frontmatter, not headings
-    "MD041": false,
-    // Emphasis as heading — common pattern for Option 1/2/3 sections
-    "MD036": false,
-    // No duplicate heading — changelog files repeat section names intentionally
-    "MD024": false,
-    // Fenced code language — not always applicable for diagram blocks
-    "MD040": false,
-    // Table column style — table alignment is visual, not semantic
-    "MD060": false,
-    // Ordered list item prefix — number resets are intentional in documents
-    "MD029": false,
-    // No inline HTML — each elements are valid in valid Markdown
-    "MD033": false,
-    // List marker space — spacing after list markers varies by editor
-    "MD030": false,
-    // Blanks around headings — not always needed in compact docs
-    "MD022": false,
-    // Blanks around lists — not always needed in compact docs
-    "MD032": false,
-    // Blanks around fences — not always needed between adjacent blocks
-    "MD031": false,
-    // Multiple blanks — editor artifacts, not semantic
-    "MD012": false,
-    // Single title — files may have multiple H1 sections
-    "MD025": false,
-    // Trailing spaces — editor artifacts
-    "MD009": false,
-    // Bare URLs — URL shortening not always needed
-    "MD034": false,
-    // Single trailing newline — editor artifacts
-    "MD047": false,
-    // Trailing punctuation — heading punctuation is intentional
-    "MD026": false,
-    // Space in emphasis — double-asterisk bold spacing varies by renderer
-    "MD037": false,
-    // No hard tabs — some generated docs use tabs for indentation
-    "MD010": false,
-    // Code block style — generated docs may use inconsistent styles
-    "MD046": false,
-    // Comment style — generated docs have no comments
-    "MD048": false,
-    // Commands show output — shell examples intentionally show only commands
-    "MD014": false
-  },
-  "ignores": [
-    "docs/api-reference/generated/**"
-  ]
-}

.markdownlintignore

@@ -1 +0,0 @@
-docs/api-reference/generated/**

README.md

@@ -151,7 +151,7 @@ Plaintext values never leave your browser.
 | Network sniffing | No plaintext on network | ✅ Protected |
 | Compromised proxy | Only sees encrypted data | ✅ Protected |
 | Browser XSS | Headlamp CSP policies | ⚠️ Standard web security |
-| Supply chain | Package locks, Renovate | ⚠️ Ongoing monitoring |
+| Supply chain | Package locks, dependabot | ⚠️ Ongoing monitoring |
 
 See: [ADR 003: Client-Side Encryption](docs/architecture/adr/003-client-side-crypto.md)
 

SECURITY.md

@@ -70,7 +70,7 @@ Key dependencies with security implications:
 - **node-forge**: Used for client-side encryption of secret values with the cluster's sealing certificate. Keep this dependency up to date.
 - **@kinvolk/headlamp-plugin**: Peer dependency providing the Kubernetes API proxy. Update by upgrading your Headlamp installation.
 
-The project uses `npm audit` and Renovate to monitor for known vulnerabilities.
+The project uses `npm audit` and Dependabot to monitor for known vulnerabilities.
 
 ## Contact
 

docs/architecture/adr/003-client-side-crypto.md

@@ -349,7 +349,7 @@ Added type safety:
 
 **Supply Chain**:
 - Risk: Compromised node-forge dependency
-- Mitigation: Package lock, Renovate, regular audits
+- Mitigation: Package lock, dependabot, regular audits
 - Same risk as any JavaScript dependency
 
 **Browser Extensions**:

docs/getting-started/installation.md

@@ -121,7 +121,7 @@ For Headlamp running in Kubernetes:
    kubectl create configmap headlamp-sealed-secrets-plugin \
      --from-file=main.js=dist/main.js \
      --from-file=package.json=package.json \
-     -n headlamp
+     -n kube-system
    ```
 
 2. **Update Headlamp deployment**:
@@ -149,7 +149,7 @@ For Headlamp running in Kubernetes:
 3. **Apply and restart**:
    ```bash
    kubectl apply -f headlamp-deployment.yaml
-   kubectl rollout restart deployment/headlamp -n headlamp
+   kubectl rollout restart deployment/headlamp -n kube-system
    ```
 
 ## Verification