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

This reverts commit c815e4c54c.

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

introduction/code-of-conduct.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: default
-redirect_from:
-- /code-of-conduct/
+permalink: /code-of-conduct/
 ref: 118
 title: Code of Conduct
 ---

introduction/contributing.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/contributing/
 redirect_from:
-- /doc/contributing/
 - /en/doc/contributing/
 - /doc/ContributingHowto/
 - /wiki/ContributingHowto/

introduction/experts.md

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: experts
-redirect_from:
-- /experts/
+permalink: /experts/
 ref: 119
 title: Experts
 ---

introduction/faq.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: sidebar
+permalink: /faq/
 redirect_from:
-- /faq/
 - /doc/user-faq/
 - /en/doc/user-faq/
 - /doc/UserFaq/

introduction/intro.html

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: default
+permalink: /intro/
 redirect_from:
-- /intro/
 - /tour/
 - /en/tour/
 - /about/

introduction/reporting-bugs.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: doc
+permalink: /doc/reporting-bugs/
 redirect_from:
-- /doc/reporting-bugs/
 - /en/doc/reporting-bugs/
 - /doc/BugReportingGuide/
 - /wiki/BugReportingGuide/

introduction/screenshots.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: default
+permalink: /screenshots/
 redirect_from:
-- /screenshots/
 - /media/
 - /doc/QubesScreenshots/
 - /wiki/QubesScreenshots/

introduction/statistics.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: default
+permalink: /statistics/
 redirect_from:
-- /statistics/
 - /counter/
 ref: 127
 title: Statistics

introduction/support.md

@@ -1,8 +1,8 @@
 ---
 lang: en
 layout: sidebar
+permalink: /support/
 redirect_from:
-- /support/
 - /help/
 - /mailing-lists/
 - /doc/mailing-lists/

introduction/video-tours.html

@@ -1,8 +1,7 @@
 ---
 lang: en
 layout: default
-redirect_from:
-- /video-tours/
+permalink: /video-tours/
 ref: 226
 title: Video Tours of Qubes OS
 ---