[Feature] Implements close icon for vocabulary

[egbadon-victor]

Fixes

• Fixes [Feature] Include Close Icon in the vocabulary design system #304 by @egbadon-victor

Description

This PR adds a close icon to to the vocabulary source files.

Technical details

The SVG implementation was gotten from the official font awesome website, then resizes to be compatibility with the existing viewBox="0 0 30 30" property.

Tests

• Launch the project on your browser on your local machine
• Go to any test context, and implement a close icon using the following code
  <span class="icon-replace fa-close">Close</span>
  -Observe the close icon displays properly

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.

Developer Certificate of Origin

For the purposes of this DCO, "license" is equivalent to "license or public domain dedication," and "open source license" is equivalent to "open content license or public domain dedication."

Developer Certificate of Origin

Developer Certificate of Origin
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    have the right to submit it under the open source license
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    of my knowledge, is covered under an appropriate open source
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