Added selection menu to install all steps, or individual
Added reference to autoexec.sh
Added Python Runtime Environment installation workflow
The new Python workflow will allow users to run ENiGMA½ on modern Linux distributions such as Ubuntu 24.04 per my note in #537.
It is my strong recommendation that we offer the user the use of pyenv, as this will decouple the distribution's Python interpreter from that of ENiGMA½ -- this will make the software more portable. It is poor advice to give a user that they upgrade their OS Python Interpreter; doing so can break the operating system if there are incompatibilities.
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