[REFACTOR] General small app improvements

[Lissy93]

Please check the type of change your PR introduces:

• Bugfix
• Feature

Issue Number (if applicable): #54 , #55 and #41

Briefly outline your changes:

• Adds license
• Improves service workers, and adds serviceWorkerStatus local storage item [BUG] Service worker is hard-caching website #54
• Adds missing statusCheck and statusCheckInterval docs into Configuring.md
• Adds an About App page, containing info needed to raise a bug report
• Adds TDLR license into main readme
• Introduces app versioning
• Adds safeguards into ConfigAccumalaror, to prevent error being thrown
• Updates PR template
• Improved Webpack build experience, with progress bar and completion notification
• Adds new and improved icons for layout options
• (Finally) fixed the sticky footer so that it is now stickey
• Make the Page Title into a home page link
• Adds some sexy ascii art into the welcome message
• Adds missing favicon, Re: [BUG] Favicon not present #55
• Adds assets to PWA manifest.json
• Documents app commands in readme
• Enable passing website as URL param to the workspace
• Modified items, so that title text doesn't get shortened, Re: [BUG] Title cut when icon size is set to small #41

Before submitting, please ensure that:

• Must be backwards compatible
• All lint checks and tests must pass
• If a new option in the the config file is added, it needs to be added into the schema, and documented in the configuring guide
• If a new dependency is required, it must be essential, and it must be thoroughly checked out for security or efficiency issues

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