Improve the error pages
The current error pages for when a document or page isn't found are boring and ugly. Let's make shiny new errors pages. Make them fun, why not? I'm open to mockups and suggestions. A few requirements:
- The document not found error should have a link to search for packages containing the document.
- The page not found error should have a search box to search pages in the document.
- The pages must be accessible, so don't rely on images alone to convey information.
- The pages must be localizable, so putting text in images is probably out unless you're clever.
- We can't pull in extra fonts. I'm not installing any just for the error pages, and we can't load from the web.
Screenshots of the current error pages attached: