Use new APT deployment script

[ChristopherHX]

I still have no idea what "aptian" is, neither I find anything about it.

[igagis]

Here is a short story of how aptian appeared https://github.com/freight-team/freight/issues/140

[ChristopherHX]

Wow, you have created a great tool for managing apt repositories.

For my GitHub Pages based apt repo freight	aptian
2h 38min	0h 1min 38s

[igagis]

Thanks! Yes, it works much faster.