Revert "Remove all instances of permalink: in YAML frontmatter"

This reverts commit c815e4c54c.

https://github.com/QubesOS/qubes-issues/issues/6701#issuecomment-862822827

user/security-in-qubes/anti-evil-maid.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/anti-evil-maid/
 redirect_from:
-- /doc/anti-evil-maid/
 - /en/doc/anti-evil-maid/
 - /doc/AntiEvilMaid/
 - /wiki/AntiEvilMaid/

user/security-in-qubes/data-leaks.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/data-leaks/
 redirect_from:
-- /doc/data-leaks/
 - /en/doc/data-leaks/
 - /doc/DataLeaks/
 - /wiki/DataLeaks/

user/security-in-qubes/device-handling-security.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: doc
-redirect_from:
-- /doc/device-handling-security/
+permalink: /doc/device-handling-security/
 ref: 170
 title: Device Handling Security
 ---

user/security-in-qubes/firewall.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/firewall/
 redirect_from:
-- /doc/firewall/
 - /doc/qubes-firewall/
 - /en/doc/qubes-firewall/
 - /doc/QubesFirewall/

user/security-in-qubes/split-gpg.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/split-gpg/
 redirect_from:
-- /doc/split-gpg/
 - /en/doc/split-gpg/
 - /doc/SplitGpg/
 - /doc/UserDoc/SplitGpg/

user/security-in-qubes/u2f-proxy.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: doc
-redirect_from:
-- /doc/u2f-proxy/
+permalink: /doc/u2f-proxy/
 ref: 167
 title: The Qubes U2F Proxy
 ---

user/security-in-qubes/vm-sudo.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/vm-sudo/
 redirect_from:
-- /doc/vm-sudo/
 - /en/doc/vm-sudo/
 - /doc/VMSudo/
 - /wiki/VMSudo/

user/security-in-qubes/yubi-key.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/yubi-key/
 redirect_from:
-- /doc/yubi-key/
 - /en/doc/yubi-key/
 - /doc/YubiKey/
 ref: 169