Start of doc improvements: better copywriting in README.md

Let me know what you think, Tom!

A note on the "The Errors of Our Past" section: I made the text stronger, and also added "(and Present!)" to the header, because I think that is the truth, and if so, the writing (and Scorched) should own it. Let me know if u have a problem with that.

I have more stuff coming, but I'm a perfectionist, so just give me some time... That, and I need to work on other stuff as well!