add: crystal language icon (#311)

* add: crystal icon (#263)

* use svg template and update svg size

* remove unused path from crystal svg

* Updated to template

* Update size

images/svg/crystal.svg

@@ -0,0 +1,7 @@
+<svg
+xmlns="http://www.w3.org/2000/svg"
+aria-label="Crystal" role="img"
+viewBox="0 0 512 512"><rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/><path d="M448.231 308.479L308.661 447.77c-.559.558-1.396.838-1.955.558l-190.653-51.082c-.838-.28-1.396-.838-1.396-1.396L63.295 205.475c-.28-.837 0-1.395.558-1.954L203.424 64.23c.558-.558 1.396-.838 1.954-.558l190.654 51.082c.837.28 1.395.838 1.395 1.396l51.083 190.375c.559.837.28 1.395-.279 1.954zM261.206 156.905L73.902 206.87c-.279 0-.558.558-.279.838l137.059 136.779c.279.279.837.279.837-.28l50.246-187.024c.279 0-.28-.558-.559-.28z"/></svg>