add generic placeholder to index

index.md

@@ -11,16 +11,4 @@ The How-to cards are intended to provide practical guidance in implementing Data
 
 ## Index
 
-  * [Exchange data with collaborators](./external/exchange-channels/)
-  * [Git clients](./external/git-clients/)
-  * [LUMS account](./external/lums-passwords)
-  * [Markdown markup language](./external/markdown/)
-  * [Password management](./external/passwords/)
-  * [Reset UL password with a Mac](./external/passwords/mac-reset)
-  * [Registering human-subject data to DAISY](./external/daisy/)
-  * [VPN-Cerbere](./external/vpn-cerbere-access/)
-  * [Installing-Owncloud-Client](./external/installing-owncloud-client/)
-  * git, markdown, and how to contribute to a repository
-    * [Git clients](./external/contribute/git-clients/)
-    * [Markdown](./external/contribute/write-markdown/)
-    * [How to add or edit a howto card](./external/contribute/add-edit-card/)
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+[[ index ]]
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