Remove all instances of permalink: in YAML frontmatter

Converts existing permalink paths into redirect_from entries.

QubesOS/qubes-issues#6701

developer/general/devel-books.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
-permalink: /doc/devel-books/
 redirect_from:
+- /doc/devel-books/
 - /en/doc/devel-books/
 - /doc/DevelBooks/
 - /wiki/DevelBooks/

developer/general/doc-guidelines.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
-permalink: /doc/doc-guidelines/
 redirect_from:
+- /doc/doc-guidelines/
 - /en/doc/doc-guidelines/
 - /wiki/DocStyle/
 - /doc/DocStyle/

developer/general/gsoc.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: sidebar
-permalink: /gsoc/
 redirect_from:
+- /gsoc/
 - /GSoC/
 ref: 33
 ---

developer/general/gsod.md

@@ -1,7 +1,8 @@
 ---
 lang: en
 layout: sidebar
-permalink: /gsod/
+redirect_from:
+- /gsod/
 ref: 242
 ---
 

developer/general/join.md

@@ -1,7 +1,8 @@
 ---
 lang: en
 layout: sidebar
-permalink: /join/
+redirect_from:
+- /join/
 ref: 26
 ---
 

developer/general/package-contributions.md

@@ -1,7 +1,8 @@
 ---
 lang: en
 layout: doc
-permalink: /doc/package-contributions/
+redirect_from:
+- /doc/package-contributions/
 ref: 29
 ---
 

developer/general/style-guide.md

@@ -1,6 +1,7 @@
 ---
 lang: en
 layout: doc
-permalink: /doc/style-guide/
+redirect_from:
+- /doc/style-guide/
 ref: 27
 ---

developer/general/usability-ux.md

@@ -1,7 +1,8 @@
 ---
 lang: en
 layout: doc
-permalink: /doc/usability-ux/
+redirect_from:
+- /doc/usability-ux/
 ref: 31
 ---