a11y GUI review: XIAS Guest Users page

[Premas]

Pull Request

Intent

Proposed Changes

This pull request updates the “How Do I Create a XIAS Account?” section for better accessibility and readability:

• Added or updated alt text to images.
• Reviewed web pages to identify missing fields or links and rewrote the documentation for improved readability.

Changes to Section Headers

Changes to Page URLs

Related or Fixed Issues

Fixes #1154

Accessibility Checklist

I have ensured all of the following for new or changed content:

• all images have appropriate alt text. Guidelines
• all images with text have sufficient contrast ratio. Checker
• all image text is transcribed or described in body text.
• all technical terms, jargon, and abbreviations are introduced before they are used.

Style Checklist

I have done all of the following:

• searched for other relevant pages and crosslinked from my content to them.
• searched for other relevant pages and crosslinked from them to my content.
• added redirects in mkdocs.yml for any moved headers or pages.
• defined new technical terms, jargon, and abbreviations in the glossary.
• searched for existing technical terms, jargon, and abbreviations in the glossary and added crosslinks to them.
• properly formatted and introduced key branding terms. List here.

[wwarriner]

Great work! Few adjustments to do as we discussed at the meeting. Looking forward to the remaining pages which will hopefully be easier now that you've got this experience in.

Please remember to add your a11y findings as issues (one issue per XIAS website page) here: https://gitlab.rc.uab.edu/rc-data-science/xias-website-a11y-recommendations#

[Premas]

All changes are incorporated for review. Thank you.