Add tests to homepage / home-nav / modal signin window

[brecke]

Resources:

• Svelte with TypeScript and Jest (Starter Project)
• Testing Svelte components with Jest
• How to test Svelte components
• https://sveltesociety.dev/recipes/testing-and-debugging/unit-testing-svelte-component/
• https://testing-library.com/docs/svelte-testing-library/example/
• https://testing-library.com/docs/cypress-testing-library/intro/
• https://www.thisdot.co/blog/testing-web-components-with-cypress-and-typescript

Egghead resources on cypress:

• https://egghead.io/lessons/cypress-use-cy-server-and-cy-route-to-control-api-response-in-a-cypress-test
• https://egghead.io/courses/test-production-ready-apps-with-cypress
• https://egghead.io/courses/end-to-end-testing-with-cypress

TODO:

• Setup Jest / Testing-library for unit testing
• Setup Cypress
  • Create admin user as a before fn (can't have access to admin backend for now)
  • Create regular user as a before fn (can't have access to admin backend for now)