Edit pass on Chapter 01

[rupsis]

All changes presented here are suggestions.

These suggestions are largely subjective, with the occasional objective suggestion (i.e spelling correction). I'll try to annotate my changes, and provide additional editing notes.

Feel free to either open a dialogue on this PR, and I'll work with you on edits. Or use this as a reference (cherry pick suggestions) and close the PR out.

Note: This is an editing pass, and by no means a comprehensive revision.