Improved docker deployments

[Lissy93]

Please check the type of change your PR introduces:

• Build-related changes
• Slight UI improvements

Issue Number (if applicable): N/A

Briefly outline your changes:

• Adds healthceck into Docker container, and writes a node file to service said check
• Changes default port in docker-compose, as 8080 is commonly used by other apps
• Adds 1-Click deploy using PWD into the readme
• Updates dependencies
• Adds a getting started guide to the docs
• Adds splash screen for first load
• Deleted unused assets
• Fixes lint errors in server.js and validate-config.js, and adds linting as a pre-commit hook

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