Added social icon for Unity (#1760)

* Added social icon for Unity

SVG source: https://icons.getbootstrap.com/icons/unity/

* refactor

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Co-authored-by: Aditya Telange <21258296+adityatelange@users.noreply.github.com>

Author: tool-buddy

layouts/partials/svg.html

@@ -889,6 +889,10 @@
         d="M23 3a10.9 10.9 0 0 1-3.14 1.53 4.48 4.48 0 0 0-7.86 3v1A10.66 10.66 0 0 1 3 4s-4 9 5 13a11.64 11.64 0 0 1-7 2c9 5 20 0 20-11.5a4.5 4.5 0 0 0-.08-.83A7.72 7.72 0 0 0 23 3z">
     </path>
 </svg>
+{{- else if (eq $icon_name "unity") -}}
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" fill="currentColor">
+  <path d="M15 11.2V3.733L8.61 0v2.867l2.503 1.466c.099.067.099.2 0 .234L8.148 6.3c-.099.067-.197.033-.263 0L4.92 4.567c-.099-.034-.099-.2 0-.234l2.504-1.466V0L1 3.733V11.2v-.033.033l2.438-1.433V6.833c0-.1.131-.166.197-.133L6.6 8.433c.099.067.132.134.132.234v3.466c0 .1-.132.167-.198.134L4.031 10.8l-2.438 1.433L7.983 16l6.391-3.733-2.438-1.434L9.434 12.3c-.099.067-.198 0-.198-.133V8.7c0-.1.066-.2.132-.233l2.965-1.734c.099-.066.197 0 .197.134V9.8z"/>
+</svg>
 {{- else if (eq $icon_name "unsplash") -}}
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 40">
     <path fill="none" stroke="currentColor" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="4"