server/templates/static-ui-extensions.xml

<?xml version="1.0" ?>
<teamcity-static-ui-extensions>
  <rule place-id="BEFORE_CONTENT" html-file="beforeContent.html">
    <url equals=""/>
    <url starts="overview.html"/>
  </rule>

  <!-- 
     you may include HTML, css or js contents with page places 

     <rule place-id="[put place id here]" 
           html-file="[put html file from this folder]"
           js-file="[put js file from this folder]"
           css-files="[put css file from this folder]">
         
         this is the rule to make page place work only for URLs that starts with
         <url starts="overview.html" />

         this is the rule to only include content if URL is equal to 
         <url equals="viewType.html" />

         this is the rule to only include content if URL contains
         <url contains="viewType.html" />

         you may add as much rules / url constraints as you like.
     </rule>

    The full list of page extensions is available at:
    http://javadoc.jetbrains.net/teamcity/openapi/current/jetbrains/buildServer/web/openapi/PlaceId.html

    @@@PAGE_PLACES_LIST@@@
  -->

</teamcity-static-ui-extensions>