Update favicon emoji in config

Changed the favicon emoji in _config.yml from '⚛️' to '⚛' for consistency or display purposes.

Author: dadavidson

_config.yml

@@ -16,7 +16,7 @@ description: > # the ">" symbol means to ignore newlines until "footer_text:"
 #  Photos from <a href="https://unsplash.com" target="_blank">Unsplash</a>.
 keywords: jekyll, jekyll-theme, academic-website, portfolio-website # add your own keywords or leave empty
 lang: en # the language of your site (for example: en, fr, cn, ru, etc.)
-icon: ⚛️ # the emoji used as the favicon (alternatively, provide image name in /assets/img/)
+icon: ⚛ # the emoji used as the favicon (alternatively, provide image name in /assets/img/)
 
 url: https://dadavidson.github.io # the base hostname & protocol for your site
 baseurl: # the subpath of your site, e.g. /blog/. Leave blank for root