Update blog list template

Having `front-page.php`, `home.php` and `index.php` templates started to seem like overkill. This PR suggests that we remove `home.php` and use `index.php` instead.
But there isn't anything to edit on this page now from /wp-admin/. The page title comes in automatically here: https://github.com/wp-evolved/evolved-theme/blob/update-blog-list-template/themes/evolved-parent-theme/index.php#L7. And everything else is just the posts listing.