Reformat the tables

[cjsha]

Also:

• Propose edits for top-level "generations-differences" description
• Add sphinx-design
• Minor edits here & there

Feel free to pick & choose edits you'd like to incorporate into the acq-board-3d branch (if any)

[cjsha]

oh, and a couple nitpicks:

• This is in reference to the image on the primary landing page. I feel like the frosted acrylic top makes the image of the unpowered acquisition board look... blurry? Is there a picture of the acq board with the LEDs on?
  
  but don't worry about it if changing this photo takes too much time
• In the Hardware Requirements page top photo, is it worth putting "(optional) SPI Commutator" instead of "SPI Commutator"? I'm not sure this is a good idea, just something I thought of that could be helpful.