* website/posts/error-success.md: Fix typo.
* website/posts/error-success.md, website/static/blog/img/error-success-sticker-bird.jpg, website/static/blog/img/error-success-sticker-pile.jpg, website/static/blog/img/error-success-sticker.svg, website/static/blog/img/error-success.jpg: New files.