Move icon templates out of pod directory

Glimmer components don't have extra markup around them, so we don't need
the component JS files anymore. Also, we can easily ignore the icon
templates when linting now.

app/templates/components/icon-warning.hbs

@@ -0,0 +1,15 @@
+<svg width="60px" height="60px" version="1.1" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <g fill="none" fill-rule="evenodd">
+    <g transform="translate(-479,-238)" stroke="#fbe468" stroke-linecap="round" stroke-linejoin="round" stroke-width="1">
+      <g transform="translate(482,244)">
+        <a transform="translate(0,2)">
+          <polygon id="Triangle-58" points="0.15321 44 27 0 53.847 44"/>
+        </a>
+        <rect x="25" y="13" width="4" height="21"/>
+        <a transform="translate(0,2)">
+          <circle cx="27" cy="38" r="2"/>
+        </a>
+      </g>
+    </g>
+  </g>
+</svg>