Guide intro visual refresh

[marczych]

The guide intro page leaves a lot to be desired. Here are Kyle's comments originally from #109.

• Introduction view needs a background image, or something other than a white background.
• Add flags to introduction
• Intro and tools display pages are very plain—perhaps a background image like iOS or a graphic from Tony?
• On simple guides with just a few tools, you end up with blank intro, blank tools page, no indication there's anything good coming
• I don't think parts and tools shouldn't be two separate pages. You're never going to fill up both lists, and it's a whole lot of scrolling to get to the interesting part of a guide.

Here's a list of things we might want to include:

• Guide title
• Device
• Number of favorites
• Number of completions
• Author's name, avatar, reputation
• Flags
• Stories
• Comments
• Published date
• Last modified date
• Parts and Tools