add passwords to index and rearrange

index.md

@@ -11,7 +11,8 @@ Bioinformatics Core assists Luxembourg Centre for Systems Biomedicine ([LCSB](ht
 ## Current howto-cards
 
   * [Exchange data with collaborators](./external/exchange-channels/)
-  * [Registering human-subject data to DAISY](./external/daisy/)
-  * [Markdown markup language](./external/markdown/)
-  * [LUMS account](./external/lums-passwords)
   * [Git clients](./external/git-clients/)
+  * [LUMS account](./external/lums-passwords)
+  * [Markdown markup language](./external/markdown/)
+  * [Password management](./internal/passwords/)
+  * [Registering human-subject data to DAISY](./external/daisy/)