Add findx as a Search Provider

[jonathansampson]

Test plan

Make sure findx can be found on the preferences page and :fx works

---

It has been requested that we add support for the findx search engine.

{
  "name": "findx",
  "base": "https://www.findx.com",
  "image": "https://www.findx.com/favicon.ico",
  "search": "https://www.findx.com/search?q={searchTerms}&type=web",
  "autocomplete": "https://www.findx.com/api/web-search/suggestions/?q={searchTerms}",
  "shortcut": ":fx"
}

The autocomplete list has the following structure:

[
  { "phrase": "bravenewworldtgp.com", "score": 61 },
  { "phrase": "braves", "score": 35 },
  { "phrase": "brave new world", "score": 21 },
  { "phrase": "braveheart", "score": 19 },
  { "phrase": "bravenet", "score": 16 },
  { "phrase": "bravenet.com", "score": 15 },
  { "phrase": "braves baseball", "score": 14 },
  { "phrase": "braves tickets", "score": 11 },
  { "phrase": "braves.com", "score": 8 },
  { "phrase": "bravedial.net", "score": 5 },
  { "phrase": "braves baseball schedule", "score": 5 },
  { "phrase": "bravehost", "score": 5 },
  { "phrase": "bravetti", "score": 5 },
  { "phrase": "brave heart", "score": 4 },
  { "phrase": "brave new world surf shop", "score": 4 },
  { "phrase": "braves schedule", "score": 4 },
  { "phrase": "brave new world nj", "score": 4 },
  { "phrase": "braveheart american bulldogs", "score": 3 },
  { "phrase": "braves spring training", "score": 3 },
  { "phrase": "bravegirls", "score": 3 },
  { "phrase": "bravedeal.net", "score": 3 }
]

Requires modification to browser-laptop/js/data/searchProviders.js