📝 Document git clone over ssh (#736)
* 📝 Document git clone over ssh
* 📝 New page about Git over SSH
* Add in TOC
* Update docs/hub/security-git-ssh.md
Co-authored-by: Julien Chaumond <julien@huggingface.co>
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Co-authored-by: Julien Chaumond <julien@huggingface.co>