Add a doc page with plugins that can cause conflicts

[Valentina R]

• Siteground Optimizer (Memcached)

  • issue with paid app status
  • issue with duplicate “New order” emails
  • issue with not being able to update appointments in admin when gCal is connected
  • issue with orders and appointments not being linked

• Sucuri

  • php warning and Book button not working

• Deposits

  • Duplicated events

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