Removes react-ga module and related code; the react-ga module does not support GA4.
Instead, loads google analytics code via page.template
For Google Analytics to activate, the config.analytics entry must be set in config.js to the Google Analytics 4 tag in use such as "G-xxxxxxxxxx". (Might work with the older UA-xxx tags but not sure.)
eg
module.exports = {
captcha_key: '', /* enter captch key here */
backend_url: 'http://brcaexchange.org/backend',
analytics: 'G-xxxxxxxxxx',
environment: 'production'
};
Fixes issue #1433
eg