Stepper style

[obulat]

Fixes

Fixes #205 by @panchovm

Description

This PR makes the whole completed step clickable and changes a completed step's border color when hovered. Also, it removes the border-radius from the stepper.

Screenshot

Technical details

This PR also refactors Stepper and *step components:

• names of step parts were changed to be more in line with other stepper implementations (buefy, etc)
• StepHeader with the Step Heading and Step Caption was extracted as a separate component, simplifying both Stepper and *Step components.
• StepContent was greatly simplified by using dynamic components (component :is)

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[obulat]

These changes can be previewed here: https://nostalgic-villani-d2be5c.netlify.app/

[dhruvkb]

When the "Next" button becomes active (shouldn't the next step also be clickable)?

[obulat]

When the "Next" button becomes active (shouldn't the next step also be clickable)?
From what we've discussed with Anna, Francisco, and Kriti, the next steps should not be clickable. To go to the next step, the user has to click the 'Next' button.
Only the completed steps should be clickable so that the user can go back and check the answers, if necessary.

Thank you for your review!