Added more notes as I developed the Guix overlay for NixOS over time. It
does have a nice experience, overall (albeit clunky one due to the documentation).
The topics I've covered so far for Linux, package managers, archiving,
and learning.
I also updated some formatting for other notes especially with the
command line references.
Now, it's all under the notebook umbrella. Seems to be appropriate as it
is just my notes after all.
I also updated some notes from there. I didn't keep track of what it is
this time. Something about more learning notes extracted from my
"Learning how to learn" course notes and then some. Lack of time and
hurriness just makes it difficult to track but it should be under
version control already.
