feat(GlAnimatedIcon): Add documentation
What does this MR do?
Add a new documentation page for a GlAnimatedIcon component.
Does this MR meet the acceptance criteria?
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The MR title and commit messages meet the Pajamas commit conventions. 
- [c] The “What does this MR do?” section in the MR description is filled out, explaining the reasons for and scope of the proposed changes, per “Say why not just what”.
- For example, if the MR is focused on usage guidelines, addressing accessibility challenges could be added in a separate MR.
 
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Relevant label(s) are applied to the MR. 
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The MR is added to a milestone. 
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If creating a new component page from scratch, it follows the page template structure. 
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Content follows the Pajamas voice and tone guidelines, falling back on the GitLab Documentation Style Guide when needed. 
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Related pages are cross-linked, where helpful. Component pages have related components and patterns defined in their Markdown front matter. 
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If embedding a Figma file, it follows the Figma embed guide. 
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Review requested from any GitLab designer or directly from a maintainer or trainee maintainer. 
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Maintainer review follows the Pajamas UX maintainer review checklist. 
Links
Edited  by Jeremy Elder