Update foreword.md

Most of the small things I changed were general language issues/figures of speech, but here's a few comments about what I changed to fix the flow of the narrative as a whole:
Line 5 - "stress" is implied.  I don't think you need it in the list.
Line 7 - I think "large windows" gets the "natural light" point across and makes the paragraph shorter.
Line 9 - I moved this up from a few paragraphs down, because it's a nice introduction to the issue you faced: a seemingly ideal work environment going bad.
Line 19 - It felt like you needed a segue between the Google statement and starting your own company.  Otherwise, it just sounds like you wanted to work for Google.  I added "It inspired me" at the end, but if you have a better idea, that's cool, too.
Line 23 - Okay, so you added this huge block of text about working from home with your mom, and I really don't think it adds anything to the story of how you quit one terrible work environment just to make a worse one.  We all know what nagging moms who don't understand us are like.  It's not necessary here.
Line 27 - Architecting is not a word!
Line 29 - Changed "bad" to "life-consuming" because it felt a little more descriptive.
Line 39 - Changed "alone" to "away from my responsibilities", which implies alone, but gets to the heart of why.
Line 51 - "The job I tried so hard to escape wasn't even half as bad as the job I created." I think changing this slightly helps summarize the entire story in a powerful way.