Stash section improvements

[querkmachine]

The stash is a new section for dumping links to interesting web design, development and accessibility resources. It's still a lil rough around the edges.

• Add RSS feed
• Add styles for inline code snippets
• Add source domain (e.g. 'from example.com')
• Revisit layout (not keen on columns, personally)
• Probably need to think about pagination sooner rather than later