Add icons

Also move xplr.desktop to assets/desktop

assets/icon/xplr.svg

@@ -0,0 +1,11 @@
+<svg width="128" height="128" viewBox="0 0 128 128" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect width="128" height="128" rx="18" fill="#272727"/>
+<rect x="15" y="19" width="44" height="39" rx="5" fill="#37474F"/>
+<rect x="71" y="19" width="44" height="39" rx="5" fill="#37474F"/>
+<rect x="15" y="73" width="44" height="39" rx="5" fill="#37474F"/>
+<rect x="71" y="73" width="44" height="39" rx="5" fill="#37474F"/>
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+</svg>