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Add robot.txt

This is mainly a SEO thing. This file is almost never altered. Put this file in the static folder.

Add sitmap.xml

This is also SEO. This file must be updated when you add or edit your content. Although it is not static, I find it appropriate to use the static folder also for this file.

Add favicon.ico etc

There is favicon generator on the web. You upload a pixel (png or similar). Preferable transparent png. Apple has their own favicons (apple-touch-icons) that looks better on iPone.