Organisation pages need formatting tweaks for sitewide consistency

[keenanandrew]

Organisation pages (example) have formatting issues around their image and text spacing.

• [x] Address banner spacing around image
• [ ] Investigate standardising image size on both organisation template and content page with image template (and others)
• [ ] Style 'Add to Basket' button
• [x] Tweak or remove widgets for news / events at bottom, if there are none to show