Fix empty links (again) (#423)

* Revert "Fix empty links (#422)"

This reverts commit 3929160.

* Add sr-only text to empty links

index.php

@@ -6,19 +6,6 @@
 				embed
 				minimal
 	*/
-
-    function url(){
-      $url = sprintf(
-        "%s://%s",
-        isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off' ? 'https' : 'http',
-        $_SERVER['SERVER_NAME']
-      );
-      // Deal with localhost nonstandard ports
-      if ($_SERVER['SERVER_PORT'] != 80 && $_SERVER['SERVER_PORT'] != 443) {
-          $url .= ":".$_SERVER['SERVER_PORT'];
-      }
-      return $url;
-    }
 	$hv_output = getenv('HV_OUTPUT');
 	$outputType = false;
 
@@ -511,7 +498,7 @@ function url(){
 
 			<div id="logo">
 				<h1>
-					<span><a class="logo-icon fa fa-sun-o fa-fw" href="<?php echo url(); ?>" title="The Open-Source Solar and Heliospheric Data Browser"></a><a class="logo-text" href="<?php echo url(); ?>" title="The Open-Source Solar and Heliospheric Data Browser">Helioviewer.org</a></span>
+					<span><a class="logo-icon fa fa-sun-o fa-fw" href="" title="The Open-Source Solar and Heliospheric Data Browser"><span class="sr-only">Helioviewer.org</span></a><a class="logo-text" href="" title="The Open-Source Solar and Heliospheric Data Browser">Helioviewer.org</a></span>
 				</h1>
 			</div>
 
@@ -634,7 +621,7 @@ function url(){
 							<div class="dropdown-holder layersPresetsList" style="display:inline-block;">
 							    <ul class="clearfix">
 							        <li class="dropdown-main" style="width:30px">
-							            <a href="#" id="images-presets-dropdown" class="text-button" title="Images presets" style="font-size:0.75em;width:15px"><span class="fa fa-th"></span> <!--fa-server fa-bars--></a>
+							            <a href="#" id="images-presets-dropdown" class="text-button" title="Images presets" style="font-size:0.75em;width:15px"><span class="fa fa-th"></span> <!--fa-server fa-bars--><span class="sr-only">Layer presets</span></a>
 							            <ul class="sub-menu">
 
 							            </ul>

resources/css/helioviewer-base.css

@@ -87,4 +87,8 @@ a.light:hover {
 #mouse-coords-x, #mouse-coords-y {
     width: 40%;
     display: inline-block;
-}
+}
+
+.sr-only {
+    visibility: hidden;
+}