Tweak signup flow UI/UX [LBC-274]

[janbaykara]

• Remove repeat text for product cards
• “+ postage” or “+ p&p” label onto the product cards
• On the product page, renews, cancel any time
• For annual products, ”12 payments of £3, for a total of…”

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[melaniepatrick]

I like these changes, thanks.

-- One issue with the main text below 'Choose your plan'. When I edit it in Wagtail, it doesn't preview. However when I make the changes live, they do go live. So something is stopping it previewing properly? This is true of this area of text on the Join page, and also where it appears on the Homepage.

-- Very minor styling issue. The line with the book icon where you say how many books a month they get. Is there another book icon that is clearer? At this small size it is not immediately book-like. Also I'd prefer if the text was consistent size with line above.