[css-fonts-3] Better link to github issues.

Author: dbaron

css-fonts/Fonts.html

@@ -149,7 +149,7 @@ <h2 class="no-num no-toc" id=editors-draft-19-january-2016>Editor's Draft
      Fonts issues in Bugzilla</a>
 
     <dd><a
-     href="https://github.com/w3c/csswg-drafts/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aopen%20label%3Acss-fonts-3">css-fonts-3
+     href="https://github.com/w3c/csswg-drafts/labels/css-fonts-3">css-fonts-3
      issues in github</a>
 
     <dt>Discussion:

css-fonts/Fonts.src.html

@@ -125,7 +125,7 @@ <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
   <dt>Issues List:</dt>
     <dd><a href="https://www.w3.org/Style/CSS/Tracker/products/18">CSS3 Fonts issues in Tracker</a>
     <dd><a href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&amp;product=CSS&amp;component=Fonts&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED">CSS3 Fonts issues in Bugzilla</a>
-    <dd><a href="https://github.com/w3c/csswg-drafts/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aopen%20label%3Acss-fonts-3">css-fonts-3 issues in github</a>
+    <dd><a href="https://github.com/w3c/csswg-drafts/labels/css-fonts-3">css-fonts-3 issues in github</a>
   <dt>Discussion:</dt>
     <dd><a href="mailto:www-style@w3.org?subject=%5Bcss-fonts%5D%20feedback">www-style@w3.org</a>
          with subject line “<kbd>[css-fonts]