feat: add Nemo file manager emblems for git repo status

emblems/emblem-repo-unpushed.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48">
+  <circle cx="24" cy="24" r="21" fill="#2f6f4f" stroke="#173c29" stroke-width="1.5"/>
+  <g fill="none" stroke="#e7f5ec" stroke-width="3.5" stroke-linecap="round" stroke-linejoin="round">
+    <path d="M24 32 L24 15"/>
+    <path d="M16 22 L24 14 L32 22"/>
+  </g>
+</svg>