Update New Restoration Activities input form

[cflipse]

The form should be structured and styled in such a way that it's reasonable to fill out on a tablet while underwater. Large touch targets, obvious buttons, etc.

We should probably also remove / hide the File upload dialog during initial input. Everything here should be considered write-only, except for the image attachment, and that should be considered to be happening outside the context of an active dive, when these entries will be created.