Remove 'embed shopfront' references from user guide

[BethanOFN]

Admin Only: Language Checklist for when this Update is Complete

• Catalan
• English
• French
• German
• Italian
• Portuguese
• Russian
• Spanish
• Turkish

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Description
The 'embed shopfront' feature mentioned in the user guide is no longer supported. All references to this feature will therefore need to be removed so as not to confuse users

What is the nature of the error?

• Information (text) inaccurate
• Screen shot inaccurate/out of date
• Broken hyperlink
• Spelling mistake
• Other

URL of the page/section on which you have found inaccurate information

The English version of the Groups section of the user guide contained a subsection on embedding groups. This has been removed in the English version, but still needs to be removed from the Spanish version for example.
The digital markets page mentions embedding, so this also needs to be updated.

Additional Context
In the UK we had an enquiry from a user interested in this feature (as he'd found it in the user guide), which reflected poorly on OFN when we informed him the feature was no longer supported.