Other installation methods are outdated

Installation methods other than ZeroBundle and source installation are outdated and only supported in Python 2 version. They should also be updated and fixed for Python 3 version.

These installation methods are currently outdated:

* Arch Linux
* Gentoo Linux
* FreeBSD
* Vagrant
* Docker

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It would be also good to refactor ZeroBundle process as there are currently many (also outdated) repositories for each OS and each has a bit different (also outdated) process of bundling ZeroNet.

These bundle repositories could have some issues:

* Both [HelloZeroNet/ZeroNet-mac@dist](https://github.com/HelloZeroNet/ZeroNet-mac/tree/dist) and [HelloZeroNet/ZeroNet-dist@mac](https://github.com/HelloZeroNet/ZeroNet-dist/tree/mac) are for macOS, however, one of the repository is outdated.

* For Windows, there are [HelloZeroNet/ZeroNet-win@dist-win64](https://github.com/HelloZeroNet/ZeroNet-win/tree/dist-win64) which is Python 3 version and [HelloZeroNet/ZeroNet-win@dist](https://github.com/HelloZeroNet/ZeroNet-win/tree/dist) which is Python 2 version.

* For Linux, there is just [HelloZeroNet/ZeroNet-linux@dist-linux64](https://github.com/HelloZeroNet/ZeroNet-linux/tree/dist-linux64) for 64-bit.

* There are no macOS build scripts in [HelloZeroNet/ZeroBundle@py3](https://github.com/HelloZeroNet/ZeroBundle/tree/py3). Also, build scrits should be better separated by systems.

There are two solutions for this:

* One is to have separate repositories for each bundle distribution called `ZeroBundle-OS-NAME` (like `ZeroBundle-win`) and main repository called `ZeroBundle` for bundling scrips. That separate repositiries should have separate branches for each architrecture (32-bit and 64-bit) called `dist-ARCHITECTURE` (like `dist-64`).

* Another solution is to have just one repository where different systems and architectures are separated with branches called `OS-ARCHITECTURE` (like `win-64` or `linux-32`).

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When this all is fixed, README should have this installation options:

* ZeroBundle for Windows
* ZeroBundle for macOS
* ZeroBundle for Linux

* Source installation

* Whonix
* Arch Linux
* Gentoo Linux
* FreeBSD

* Vagrant
* Docker