Add guest info page

• Expanded output from guest info api endpoint
• Share guest info between both routes under /sponsor of the frontend.
• More localised text options added for use on the sponsor pages
• Details button on the sponsor overview page now points to the guest info page for each person.

frontend/.prettierrc

 {
   "semi": false,
   "singleQuote": true,
+  "jsxSingleQuote": true,
   "jsxBracketSameLine": false,
   "trailingComma": "es5"
 }