Update header.html (#72)

Author: stephentoub

src/index/overwrite/index/header.html

@@ -14,7 +14,7 @@
                id="search-box"
                value=""
                tabindex="1" />
-        <a id="logoText" href="/" target="_top">.NET&nbsp;Core Source&nbsp;Browser</a>
+        <a id="logoText" href="/" target="_top">.NET Source&nbsp;Browser</a>
         <span id="headerMenu">
             <a id="helpButtonLink" href="overview.html" target="s">
                 Help