Optimise send icon/add variant (#1411)

* Add `send` variant

* Optimise `send` icon

* Refine `send` variant

* Refine `send` variant

* Rename `send-2` to `send-horizonal`

icons/send-horizonal.json

@@ -0,0 +1,19 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "danielbayley"
+  ],
+  "tags": [
+    "email",
+    "message",
+    "mail",
+    "paper airplane",
+    "paper aeroplane",
+    "submit"
+  ],
+  "categories": [
+    "mail",
+    "communication",
+    "connectivity"
+  ]
+}

icons/send-horizonal.svg

@@ -0,0 +1,14 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="m3 3 3 9-3 9 19-9Z" />
+  <path d="M6 12h16" />
+</svg>

icons/send.svg

@@ -9,6 +9,6 @@
   stroke-linecap="round"
   stroke-linejoin="round"
 >
-  <line x1="22" x2="11" y1="2" y2="13" />
-  <polygon points="22 2 15 22 11 13 2 9 22 2" />
+  <path d="m22 2-7 20-4-9-9-4Z" />
+  <path d="M22 2 11 13" />
 </svg>