Accessibility: Setting headings' visual styles in an accessible way

[neeraj-2]

Fixes

Fixes #319 by @obulat

Description

It sets the headings' visual styles in an accessible way and thus enhances accessibility.

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• 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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[neeraj-2]

@obulat I think there is some problem with testing. I ran the "npm run test" command and got some errors even initially without making any changes.

[Cronus1007]

@obulat The tests for #272 which is arising this error.

[obulat]

Thank you for your great work, @neeraj-2! This PR can be merge after a minor style change is added:
The letter spacing style should be moved from 'Stepper.vue' to 'StepHeader.vue' so that the letters in the headings are not spaced out too wide:

chooser/src/components/Stepper.vue

Lines 309 to 311 in a127966

	.step-header__title.b-header {
	letter-spacing: normal;
	}

[obulat]

@obulat I think there is some problem with testing. I ran the "npm run test" command and got some errors even initially without making any changes.

Actually, this was my mistake: this logic should be tested in integration tests, not the unit tests as it is now. Can you please delete the failing test?

[zackkrida]

Great work! Thank you.

Requested changes have been made

[neeraj-2]

Great work! Thank you.

Thanks, @zackkrida, and @obulat