Refactor Special Capitalisations List to separate .json file

[bbusschots]

To make the list of custom capitalised words easier to manage they should be refactored into a separate file, ./src/speciallyCapitalisedWords.json.

This file can then be imported into defaults.js with the line:

import speciallyCapitalisedWords from './speciallyCapitalisedWords.json' with { type: 'json' };