Audit responsiveness, readability and usability on mobile.

[dennyabrain]

While we do a cursory check of new features on mobile when I build them, we've never done an indepth check. Occasionally I've noticed minor issues on mobile :

1. The padding of the header section is zero on mobile. Should be increased
2. Some images in the blog post overflow the page width, making the page scrollable in the y direction, which is unintended behaviour

As part of this issue, review all pages on a mobile browser and post screenshots or screen recordings of unexpected behaviour.