Camera settings descriptions

Companion web interface Camera page provides access to several camera settings, but we have no description as to what each setting does or how to tune it to a given scenario. Seems like the settings sliders and switches are auto-generated after querying camera, so may be difficult to document in the page, but would at least be good to document common ones on our Camera page description page.

Raised in [this forum post](https://discuss.bluerobotics.com/t/br-low-light-camera-setting-explained/10495)

Start with the Camera page description and the linked forum post about low-light camera settings. Identify the common settings worth explaining, then document what each does and how to tune it for typical scenarios; the Camera page should provide practical guidance for those settings.

Written by the indexing model from the issue text.