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

This reverts commit c815e4c54c.

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

developer/system/architecture.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/architecture/
 redirect_from:
-- /doc/architecture/
 - /doc/qubes-architecture/
 - /en/doc/qubes-architecture/
 - /doc/QubesArchitecture/

developer/system/audio.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: doc
-redirect_from:
-- /doc/audio-virtualization/
+permalink: /doc/audio-virtualization/
 ref: 60
 title: Audio Virtualization
 ---

developer/system/gui.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/gui/
 redirect_from:
-- /doc/gui/
 - /en/doc/gui/
 - /en/doc/gui-docs/
 - /doc/GUIdocs/

developer/system/networking.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/networking/
 redirect_from:
-- /doc/networking/
 - /doc/qubes-net/
 - /en/doc/qubes-net/
 - /doc/QubesNet/

developer/system/security-critical-code.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/security-critical-code/
 redirect_from:
-- /doc/security-critical-code/
 - /en/doc/security-critical-code/
 - /doc/SecurityCriticalCode/
 - /wiki/SecurityCriticalCode/

developer/system/storage-pools.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: doc
-redirect_from:
-- /doc/storage-pools/
+permalink: /doc/storage-pools/
 ref: 57
 title: Storage Pools
 ---

developer/system/system-doc.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/system-doc/
 redirect_from:
-- /doc/system-doc/
 - /en/doc/system-doc/
 - /doc/SystemDoc/
 - /wiki/SystemDoc/

developer/system/template-implementation.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/template-implementation/
 redirect_from:
-- /doc/template-implementation/
 - /en/doc/template-implementation/
 - /doc/TemplateImplementation/
 - /wiki/TemplateImplementation/