Fixes #1326 - remove unused font awesome library

[trubach]

Closes #1326

Summary

Removes the bundled Font Awesome 4.7.0 library and the dead  illinois-icons.css  stylesheet from the theme. Font Awesome was loaded site-wide via the  global  library but only used for 3 decorative arrow glyphs, and  illinois-icons.css  was never matched by any markup (icons render through the Toolkit  <ilw-icon>  web component). This removes ~43 unnecessary files and trims the CSS shipped on every page.

Changes

•  illinois_framework_theme.libraries.yml  — Removed both  font-awesome.css  and  illinois-icons.css  from the  global  library's  css.theme  section.
•  css/node/node.news.css  & css/node/node.blog.css  — Replaced the 3 Font Awesome arrow glyphs with plain Unicode characters (rendered in the system font, no icon font required) and removed the now-unneeded  font-family: FontAwesome;  declarations:
•  \f054  (chevron-right) →  \203A  ( › ) on  .readmore::after  — both files
•  \f101  (angle-double-right) →  \BB  ( » ) on  .hvrbox-title::after  — news
• Deleted  fonts/font-awesome-4.7.0/  — Removed the entire directory (43 files): Font Awesome CSS/min/map, webfonts +  FontAwesome.otf , the  Illinois-Icons-Line.*  font files,  illinois-icons.css , the  less/  and  scss/  source dirs, and  HELP-US-OUT.txt .
•  GEMINI.md  — Updated to drop the Font Awesome references in the library description and External Dependencies sections.

What was intentionally kept

• The  $icon_map  array and  cta_icon  logic in  illinois_framework_theme.theme  — these translate stored icon keys into    icon names and are unrelated to the removed CSS.

Testing / verification

•  grep  confirms zero remaining references to  font-awesome ,  fontawesome , or  illinois-icons  across the theme, and no remaining  \f054 / \f101  glyphs.
• Static review confirms no template/JS uses  .fa / .fa-*  or  il-icon-*  classes.
• Note: Run  lando drush cr  after merge/deploy to flush the library and CSS-aggregation registry. Spot-check that "read more" links show  › , hover-box titles show  » , and that CTA, icon-row, and footer    icons still render.

Notes for reviewers / downstream

If any sub-theme or consumer references these stylesheets or the  fonts/font-awesome-4.7.0/  path directly, it will need the same update.

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✅ Peer Review Checklist

Reviewers: Please verify the following before approving.

• The pull request links to the issue it is addressing in the comment and in the "Development" section of the PR
• There is a short summary that describes how the fix is implemented
• Verifying work: Verify that the changes made are addressing the linked issue
• Accessibility: Changes that might impact accessibility are reviewed to work with keyboard navigation and screen readers
• Responsive: Layout is tested on desktop, tablet, and mobile screens
• Config changes: Any configuration updates are tested and verified using the Distribution Update import
• Security: Output is sanitized (using t(), Twig auto-escaping, etc.). No secrects included (API keys, etc.)
• Cleanliness: All debug code (ksm(), dpm(), console.log) has been removed.
• Comments: Complex logic is explained inline.
• Documentation: Any relevant documentation has been updated (this can be a separate issue if needed)

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