Git Post-Push hook替换build文件夹

I'm working with an AngularJS app that I am hosting on Azure as a Web App.

My repository is on Bitbucket, connected as a deployment slot. I use TortoiseGit as a Windows shell for commit/pull/push. Grunt is my task runner.

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Problem: I am not managing to replace the build folder after a push has been made. This is what is being exposed on Azure (see picture):

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What I've tried:

• Batch file using Windows ftp.exe replacing the folder after push using mput
• Following this guide by taking advantages of Azure's engine for git deployment(s) that is behind every web app.
• WebHook on Bitbucket calling URL with simple PHP script doing a FTP upload

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Currently my solution is that after a push I'm building using grunt build and connecting through FTP with FileZilla and replacing build folder manually.

How can I automate this?

Thanks in advance.