Image paths in the Atom links are broken

[aquilax]

In the last blog post: https://surma.dev/things/portrait-mode/ Images in the Atom feed are broken:

<img src="./portrait-mode.jpg" width="1280" height="960">

vs

<img src="https://surma.dev/portrait-mode.87491214.jpg" width="1280" height="960">

in the html page.