Add "alt" attributes to generated HTML icon img elements

[dijitali]

Fixes

• Fixes [Bug] Generated HTML img elements have no "alt" attribute for accessibility #505 by @dijitali

Description

Adds a null alt element to img elements in generated HTML in order to improve accessibility.

Tests

See reproduction steps in #505

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 or updated 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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[dijitali]

Not sure how the code below is used and if it also needs the same change? Adding the alt attribute here didn't seem to have any noticeable result when running the project 🤷

chooser/src/components/LicenseIcons.vue

Lines 3 to 9 in 5fdc53f

	<img
	v-for="(icon, index) in [...iconsArr]"
	:key="index"
	:width="size"
	:height="size"
	:src="require(`@creativecommons/cc-assets/icons/cc-${filename(icon)}`)"
	/>

[possumbilities]

@dijitali are you still hoping to wrap this?

[dijitali]

@possumbilities - should be all set now - have removed the prettier autoformatting changes.

[TimidRobot]

I resolved the conflicts for you. Please see the requested change:

[TimidRobot]

good work! thank you!