Tachyon: Make "Tachyon" in navbar link to index.html (#142486)

Author: StanFromIreland

Lib/profiling/sampling/_heatmap_assets/heatmap_pyfile_template.html

@@ -12,7 +12,7 @@
         <header class="top-bar">
             <div class="brand">
                 <div class="brand-logo"><!-- PYTHON_LOGO --></div>
-                <span class="brand-text">Tachyon</span>
+                <a href="index.html" class="brand-text">Tachyon</a>
                 <span class="brand-divider"></span>
                 <span class="brand-subtitle" style="font-family: var(--font-mono); font-size: 13px;"><!-- FILENAME --></span>
             </div>

Lib/profiling/sampling/_shared_assets/base.css

@@ -213,10 +213,13 @@ body {
 }
 
 .brand-text {
+  font-family: var(--font-sans);
   font-weight: 700;
   font-size: 16px;
   letter-spacing: -0.3px;
   text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
+  color: inherit;
+  text-decoration: none;
 }
 
 .brand-subtitle {