- Linting (ESLint): Use two spaces for indent

- Update links in commented out copyright section of editor, link in screencast, and within SVG file comments (created with SVG-edit should refer to current URL)

editor/extensions/helloworld-icon.xml

@@ -1,15 +1,15 @@
 <svg xmlns="http://www.w3.org/2000/svg">
-<!-- 
+<!--
 	Sample icons file. This file looks like an SVG file with groups as its
 	children. Each group element has an ID that must match the ID of the button given
 	in the extension. The SVG inside the group makes up the actual icon, and
 	needs use a viewBox instead of width/height for it to scale	properly.
-	
+
 	Multiple icons can be included, each within their own group.
 -->
 	<g id="hello_world">
 		<svg width="102" height="102" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-		 <!-- Created with SVG-edit - http://svg-edit.googlecode.com/ -->
+		 <!-- Created with SVG-edit - https://github.com/SVG-Edit/svgedit -->
 		 <g>
 		  <title>Layer 1</title>
 		  <rect ry="30" rx="30" x="2.5" y="2.5" width="97" height="97" id="svg_3" fill="#008000" stroke="#000000" stroke-width="5"/>
@@ -18,4 +18,4 @@
 		 </g>
 		</svg>
 	</g>
-</svg>
+</svg>