Combined presentation sections with appnote sections.
Moved a bunch of Yosys one-liners in-line.
Better reference in interactive investigation to memdemo as a part of advanced logic cone selection (esp. because the show commands use some of the advanced features)
More :numref: because I figured out they were only failing if I didn't do a full re-make.
Reflow first section a little to help readability.
Also includes a css change to prevent code block caption text from bunching into the caption number.
Mostly in the `more_scripting` section, with part of the intro in the `scripting_intro`.
Also includes an extra todo on the installation page and some extra notes on where to find `show` details where relevant.
Krystine Sherwin