Updated ShopCam page
Primary tabs
The Shopcam page had been a mess, with four different cameras in a vertical row. I've put the four into a 2x2 table grid now, and removed all the hour-by-hour snapshots on the shop backdoor camera. Also updated the front page shopcam block to add a link text ('Other cameras') below the shopcam photo, linking to the Shopcam page.
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