Added Checkbox tests

[kamaroly]

Changelog:

1. Added status badges
2. Added unit tests for checkbox component
3. Removed field from checkbox. It's not applicable <.checkbox field={@form[:remember_me]} />

Summary by Sourcery

This pull request enhances the checkbox component by removing the unnecessary 'field' attribute, adds status badges to the README.md for better project visibility, and introduces unit tests to verify the correct rendering of the checkbox component.

• Enhancements:
  • Removed the 'field' attribute from the checkbox component as it is not applicable.
• Documentation:
  • Added status badges to the README.md file.
• Tests:
  • Added unit tests for the checkbox component to ensure it renders correctly.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request introduces several changes: it adds status badges to the README, includes unit tests for the checkbox component, and removes an inapplicable field from the checkbox component's documentation.

File-Level Changes

Files	Changes
README.md	Added various status badges to the README for better project visibility and status tracking.
lib/salad_ui/checkbox.ex test/salad_ui/checkbox_test.exs	Updated the checkbox component by removing an inapplicable field and added unit tests to ensure its correct rendering.

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