Ba/move title to config

[bradleyandrick]

Related Issue(s):

• NA

Proposed Changes:

1. Move app title from env variable to config file for completing build once deploy anywhere approach.
2. Removed mention of env variables from README as they are no longer used.
3. Added configHelper.js and DoesFaviconExistService to get-config-service

BOUNS: Add favicon config setting to allow custom favicon to be set.

To test:

test pass 🍏 npm run test

BEFORE ALL

• remove .env file from local or rename

Test config app title

• confirm APP_NAME not in config.json
• confirm LAUNCH_URL is set in config so Launch button shows
• load app
• confirm title of page is 'Filmdrop Console'
• confirm button text of launch button is Launch your own Filmdrop Demo
• stop app
• add APP_NAME setting to config.json, and don't set value
• load app
• confirm title of page is still 'Filmdrop Console'
• confirm button text of launch button is still Launch your own Filmdrop Demo
• stop app
• set value for APP_NAME setting in config.json
• load app
• confirm title of page is same as value you set in config.json
• confirm button text of launch button is Launch your own <config value>

Test config app favicon

• confirm APP_FAVICON not in config.json
• load app
• confirm filmdrop logo shows in favicon for web page
• stop app
• add APP_NAME setting to config.json, and don't set value
• load app
• confirm filmdrop logo still shows in favicon for web page
• stop app
• copy a custom image/favicon with either .ico OR .png into the /public/config folder
• set value for APP_FAVICON setting in config.json to be same name as file you added
  • see example.config.json for formatting - should just be file name without any slashes
• load app
• confirm custom favicon is set on web page load
• stop app
• delete file BUT leave value for APP_FAVICON setting in config.json
• load app
• confirm filmdrop logo shows again in favicon for web page

PR Checklist:

• [X] I have added my changes to the CHANGELOG or a CHANGELOG entry is not required.