removed dependency on "Roboto" font-family

packages/rocketchat-livechat/app/client/stylesheets/main.less

@@ -13,7 +13,7 @@ body {
 	padding: 0;
 	margin: 0;
 	font-size: 10pt;
-	font-family: "Roboto", "HelveticaNeue-Light", "sans-serif";
+	font-family: "Roboto", "HelveticaNeue", sans-serif;
 	// font-size: 14px;
 	color: @primary-font-color;
 	height: 100%;

packages/rocketchat-theme/assets/stylesheets/base.less

@@ -394,7 +394,7 @@ html {
 }
 
 body {
-	font-family: "Roboto", "HelveticaNeue-Light", "sans-serif";
+	font-family: "Roboto", "HelveticaNeue", sans-serif;
 	font-size: 14px;
 	height: 100%;
 	width: 100%;
@@ -3419,7 +3419,6 @@ a.github-fork {
 			padding: 4px 8px;
 			font-size: 18px;
 			border-bottom: 1px solid;
-			font-family: "Roboto", "HelveticaNeue-Light", "sans-serif";
 			font-weight: 400;
 			border-radius: 0px;
 			&.error {
@@ -3498,7 +3497,6 @@ a.github-fork {
 		}
 	}
 	a {
-		font-family: "Roboto", "HelveticaNeue-Light", "sans-serif";
 		font-weight: 300;
 	}
 	.cell {
@@ -3538,7 +3536,6 @@ a.github-fork {
 			&:extend(.rocket-h3);
 		}
 		p {
-			font-family: "Muli", "Roboto", "HelveticaNeue-Light", "sans-serif";
 			margin: 18px 0;
 			font-size: 16px;
 			line-height: 24px;

packages/rocketchat-theme/assets/stylesheets/utils/_fonts.import.less

-@font-face {
-  font-family: 'Roboto';
-  font-style: normal;
-  font-weight: 300;
-  src: local("Roboto Light"), 
-    local("Roboto-Light"), 
-    url("/fonts/roboto-23d439d23da3eaa8144f02e19043fab2b3f19a33.woff2") format("woff2"), 
-    url("/fonts/roboto-cd565969dd0cf49f8408deff0aed2b9d6008a06d.woff") format("woff"), 
-    url("/fonts/roboto-8fca32cc805ea3e480e6458ae7c3640d41f6c96b.ttf") format("truetype");
-}
-
-@font-face {
-  font-family: 'Roboto';
-  font-style: normal;
-  font-weight: 400;
-  /* IE6-8 compat */
-  src: url("/fonts/roboto-c8755b34719e3012d4ae9455615b1549fec1ca3f.eot");
-  src: local("Roboto"), 
-    local("Roboto-Regular"), 
-    url("/fonts/roboto-5cdbe0a3b2ecefc9c25ccefa511cf8a781c78799.woff2") format("woff2"), 
-    url("/fonts/roboto-9e2b4436ba4c5c9b33f4fca42b43d99a703467f0.woff") format("woff"), 
-    url("/fonts/roboto-148fe3b2ffcb825efff40a8378f22125ccf88cb0.svg#Roboto") format("svg"), 
-    url("/fonts/roboto-c8755b34719e3012d4ae9455615b1549fec1ca3f.eot") format("embedded-opentype"), 
-    url("/fonts/roboto-b376a31e25af67e36a420aa2348874c5a8b5c9a5.ttf") format("truetype");
-}
-
-@font-face {
-  font-family: 'Roboto';
-  font-style: normal;
-  font-weight: 500;
-  src: local("Roboto Medium"), 
-    local("Roboto-Medium"), 
-    url("/fonts/roboto-5cb23c2ac98be5b4e0fb8a97e28dda99ae76b8c7.woff2") format("woff2"), 
-    url("/fonts/roboto-d561d8824866e60a2a2d327c6b6219939b259b57.woff") format("woff"), 
-    url("/fonts/roboto-15d4ddc447af43a160ea7249c8a3b8db63b90c43.ttf") format("truetype");
-}
-
-@font-face {
-  font-family: 'Roboto';
-  font-style: normal;
-  font-weight: 700;
-  src: local("Roboto Bold"), 
-    local("Roboto-Bold"), 
-    url("/fonts/roboto-0346683d1de814a4d109387bb90bb82e0bb8aeb1.woff2") format("woff2"), 
-    url("/fonts/roboto-922ef2c34858a412764dfd5efadf3e387c8d7402.woff") format("woff"), 
-    url("/fonts/roboto-d9a17a54541b34b38ef67cf919f1ac63b44a7454.ttf") format("truetype");
-}
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