task: Add "manual" installation steps to How-To

[nuc1eon]

As suggested by @rubyFeedback:

Do we have some installation steps that can be done manually? For instance
all programs were already copied, so only something during the grub-installer
part appears to not work. I leave the GUI open for a bit longer to see what
happens; right now the installer claims that grub config is generated.

[rubyFeedback]

One thing that could potentially be useful is to split up the involved scripts into "standalone" tasks.

With that I mean, for instance:

task1: copy files to target HDD/SDD
task2: run post-install tasks
task3: install grub2

Ideally these would be standalone files, let's say python .py files; and the main installer would call them in turn successively.

Then, when something fails, we could still manually call these .py files, individually.

Ideally these standalone .py files would then also support some options that people would commonly use. I am not sure which options would fit for the grub2 task, but probably need to tell it where the relevant grub files are.

The advantage of the above would be that we could more easily recover from problems.

(I also tried to see whether I can continue booting from the grub rescue shell, after having installed most of GoboLinux, before it hanged; I could also see e. g. /System/Kernel/Boot etc... but unfortunately I did not see /sda1 there, and all tutorials I found wrote that the path to e. g. sda1 or sda2 etc... need to exist, as otherwise booting will not work. I tried to have a look at the GoboLinux wiki but could not find the part where sda1 etc... is populated. This is also a problem in that with a smaller user base.)

[nuc1eon]

Well, this task is focused on documenting the status quo (hence this repo) :)

Your ideas are nice.. so if you submit them separately as a PR, we can review them - and see whether they're fit to be included?

I urge to to limit your "feature requests" to work that your willing to put in at least the initial 90% in yourself (we're honestly having a ton of work to do already).

However bug reports and testing is always welcome.👍