217 part 3: fix 404 error page content #229
Merged
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refs #217
Fixes the 404 error page content.
Adds image of empty bookshelf and updates the text content. Image came from free site Pixabay.com, which allows use of their images on commercial sites.
View should be mobile-friendly and img should be accessible-compliant. I've added an alt-text to the image but am unsure about any other compliance items for UC.