Not all image in the Software Manual page have a border

**URL**
https://jamulus.io/wiki/Software-Manual

**Describe the bug**
Musician profile image and Input/Output channel mapping image do not have borders, while all other images (except the diagram) do have border applied.

It would be nice to have borders around these two images.

Open the Software Manual page at the reported URL and inspect how the musician profile and Input/Output channel mapping images are presented compared with the other bordered images. Update the relevant website content or styling so both images have borders, then verify the rendered page visually.

Written by the indexing model from the issue text.