Merge branch 'update-permalinks' into 'develop'

adapt permalinks

See merge request !52

external/passwords/mac-reset.md

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 layout: page
-permalink: /internal/passwords/mac-reset
+permalink: /external/passwords/mac-reset
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 # Tips when resetting University of Luxembourg Active Directory password on a Mac

external/passwords/passwords.md

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 layout: page
-permalink: /internal/passwords/
+permalink: /external/passwords/
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 # Managing your passwords