Figure out how much of each blog post to display on the index (front) page

On the old blog, we put the entirety of each blog post on the index pages. It was a conscious design choice -- it meant fewer posts got listed per index page, but you could actually read the posts by reading the index pages.

Now we have some subset of each post, and sometimes it's just a few lines, and sometimes it's "just" the first 35 bullet points of the changelog we're announcing.

We should figure out if we want to put all of each post, or just a teaser. And if we choose teaser, we should build code or policy that makes us more uniform in how much teaser we pick.

I'm including keyword ux-team because this is another one where they'd be helpful.