Spruce up the index page
The goal here is to make this sellable to the people I know who are savvy but not technical experts; a lot would probably jump at cheap international texting, if only the sign up flow was frictionless enough.
The code style is kinda messy here; I added newlines and broke up
</p><p>s where I found them, but not everywhere. This could use work.
This just edits the text, mostly, except that it does rename all the FAQ anchors, if you count that as not-text. #1 will edit the CSS (but I dunno if I want to claim #1 for myself, so feel free to get started on it)