feat: Adds LinkedIn link

Author: studioromeo

_config.yml

@@ -38,3 +38,4 @@ author:
     bluesky: https://bsky.app/profile/studioromeo.co.uk
     twitter: https://twitter.com/studioromeo
     github: https://github.com/studioromeo
+    linkedin: https://www.linkedin.com/in/robert-rhoades/

_layouts/default.html

@@ -44,6 +44,14 @@
                         </svg>
                     </a>
                 </li>
+                <li class="o-hor-nav__item">
+                    <a class="c-nav-item" href="{{ site.author.linkedin }}">
+                        <svg class="c-nav-item__icon" width="32" viewBox="0 0 600 530" preserveAspectRatio="xMidYMin">
+                            <title>LinkedIn</title>
+                            <use xlink:href="/img/icons.svg#icon-linkedin"></use>
+                        </svg>
+                    </a>
+                </li>
                 <li class="o-hor-nav__item">
                     <a class="c-nav-item" href="{{ site.author.github }}">
                         <svg class="c-nav-item__icon" width="32" viewBox="0 0 32 32" preserveAspectRatio="xMidYMin">