Finish New Image Capture Page

[lmfrench]

Finish the new image capture page

Draft document: https://docs.google.com/document/d/14qXPleOkeVAd-hMwKBvmckx4BzeJMQvXQepiOpvRgEc/edit#heading=h.bsxhtiy9jahp

@emhaston The section on image file format looks almost ready to go, so we could publish this first and add the photographic settings at a later date. If you let me know when the file format section is complete, I can publish it.

Relates to #72 - @llivermore will ask for feedback on the current guidance at the upcoming Natsca workshop to see how much of this should be kept. For now, the current guidance has been removed from the navigation but is still available if you go directly to the URL. I will keep a track of both issues, to make sure we don't duplicate content - I know Laura was also planning to review the old guidance alongside the mobilise workshop outputs.