Merge pull request ProgrammingBlockchain#47 from nopara73/master

Remove case studies from table of contents

Author: NicolasDorier

SUMMARY.md

@@ -48,6 +48,4 @@
    * [Liquid Democracy](other_types_of_asset/liquid_democracy.md)
    * [Proof of Burn and Reputation](other_types_of_asset/proof_of_burn_and_reputation.md)
    * [Protecting your private keys](security/protecting_your_private_keys.md)
-* [Case studies](implementations/README.md)
-   * [HiddenBitcoin: Managing keys](implementations/hiddenbitcoinkey_storage_hd_wallet_md.md)