Update URLs to use SimpleMDE.com

Author: Wes Cossick

README.md

@@ -203,7 +203,7 @@ horizontal-rule | drawHorizontalRule | Insert Horizontal Line<br>fa fa-minus
 preview | togglePreview | Toggle Preview<br>fa fa-eye no-disable
 side-by-side | toggleSideBySide | Toggle Side by Side<br>fa fa-columns no-disable no-mobile
 fullscreen | toggleFullScreen | Toggle Fullscreen<br>fa fa-arrows-alt no-disable no-mobile
-guide | [This link](http://nextstepwebs.github.io/simplemde-markdown-editor/markdown-guide) | Markdown Guide<br>fa fa-question-circle
+guide | [This link](https://simplemde.com/markdown-guide) | Markdown Guide<br>fa fa-question-circle
 
 Customize the toolbar using the `toolbar` option like:
 

src/js/simplemde.js

@@ -1214,7 +1214,7 @@ var toolbarBuiltInButtons = {
 	},
 	"guide": {
 		name: "guide",
-		action: "http://nextstepwebs.github.io/simplemde-markdown-editor/markdown-guide",
+		action: "https://simplemde.com/markdown-guide",
 		className: "fa fa-question-circle",
 		title: "Markdown Guide",
 		default: true