Update fonts to explicitly use web fonts for consistency

services/web/public/stylesheets/app/homepage.less

@@ -24,7 +24,6 @@
 	p:first-of-type {
 		font-size: @line-height-computed;
 		font-weight: 200;
-		letter-spacing: 1px;
 		margin-top: 0;
 		text-rendering: auto;
 		margin-bottom: @line-height-computed;

services/web/public/stylesheets/core/variables.less

@@ -49,8 +49,11 @@
 //
 //## Font, line-height, and color for body text, headings, and more.
 
-@font-family-sans-serif:  "Helvetica Neue", Helvetica, Arial, sans-serif;
-@font-family-serif:       "PT Serif", Georgia, Times, serif;
+@import url(//fonts.googleapis.com/css?family=PT+Serif:400,700);
+@import url(//fonts.googleapis.com/css?family=Open+Sans:400,300);
+
+@font-family-sans-serif:  "Open Sans", sans-serif;
+@font-family-serif:       "PT Serif", serif;
 //** Default monospace fonts for `<code>`, `<kbd>`, and `<pre>`.
 @font-family-monospace:   Menlo, Monaco, Consolas, "Courier New", monospace;
 @font-family-base:        @font-family-sans-serif;