Adds maintenance tooling

[tzmanics]

Summary

To make sure that our project stays up to date we'd like to add some tools:

• Cypress integration (for testing e2e, ref doc here)
• Renovate (for dependency management)
  add 'renovate.json` to project root

  {
    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
    "extends": [
      "local>netlify-templates/renovate-config"
    ]
  }
  

• Disable dependabot secutrity and version update alerts
• Make sure to update the README on how to remove everything
  • add section on cypress removal
  • add section on removing renovate json file
  • add comment at top of renovate json saying it can be removed if not using renovate