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

This reverts commit c815e4c54c.

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

developer/debugging/automated-tests.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/automated-tests/
 redirect_from:
-- /doc/automated-tests/
 - /en/doc/automated-tests/
 - /doc/AutomatedTests/
 ref: 45

developer/debugging/mount-lvm-image.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: doc
-redirect_from:
-- /doc/mount-lvm-image/
+permalink: /doc/mount-lvm-image/
 ref: 46
 title: Mount LVM image
 ---

developer/debugging/profiling.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/profiling/
 redirect_from:
-- /doc/profiling/
 - /en/doc/profiling/
 - /doc/Profiling/
 - /wiki/Profiling/

developer/debugging/safe-remote-ttys.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/safe-remote-ttys/
 redirect_from:
-- /doc/safe-remote-ttys/
 - /en/doc/safe-remote-ttys/
 ref: 49
 title: Safe Remote Dom0 Terminals

developer/debugging/test-bench.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/test-bench/
 redirect_from:
-- /doc/test-bench/
 - /en/doc/test-bench/
 - /doc/TestBench/
 - /wiki/TestBench/

developer/debugging/vm-interface.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/vm-interface/
 redirect_from:
-- /doc/vm-interface/
 - /en/doc/vm-interface/
 - /doc/VMInterface/
 - /doc/SystemDoc/VMInterface/

developer/debugging/windows-debugging.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/windows-debugging/
 redirect_from:
-- /doc/windows-debugging/
 - /en/doc/windows-debugging/
 - /doc/WindowsDebugging/
 - /wiki/WindowsDebugging/