This commit contains various quality improvements to
our site setup wizard, along with some rearrangement of
steps to improve the admin setup experience and encourage
admins to customize the site early to avoid "all sites look the
same" sentiment.
#### Step rearrangement
* “Your site is ready” from 3 → 4
* “Logos” from 4 → 5
* “Look and feel” from 5 → 3
#### Font selector improvements
Changes the wizard font selector dropdown to show
a preview of all fonts with a CSS class so you don't
have to choose the font to get a preview.
Also makes the fonts appear in alphabetical order.
#### Preview improvements
Placeholder text changed from lorem ipsum to actual topic titles,
category names, and post content. This makes it feel more "real".
Fixes "undefined" categories. Added a date to the topic timeline.
Fixes button rectangles and other UI elements not changing in
size when the font changed, leading to cut off text which looked super
messy. Also fixed some font color issues.
Fixed table header alignment for Latest topic list.
#### Homepage style selector improvements
Limited the big list of homepage styles to Latest, Hot, Categories with latest topics,
and Category boxes based on research into the most common options.
#### Preview header
Changed the preview header to move the hamburger to the left
and add a chat icon
#### And more!
Changed the background of the wizard to use our branded blob style.
