PATCH endpoint for /card/:cardId URI

[kdduan]

• used to update the contents of a card
• should use the cardId parameter and accept a JSON along the lines of

  {
  “tagline”:“string”,
  “name”:“string”,
  “city”:“string”,
  “summary”:“string”,
  “sectionLabel0":“string”,
  “sectionLabel1":“string“,
  “sectionLabel2”:“string”,
  “sectionContent0”:“string”,
  “sectionContent1”:“string”,
  “sectionContent2”:“string”,
  “sliderLabelMin”:“string”,
  “sliderLabelMax”:“string”,
  “sliderValue”:int
  }