Update `Webenv/App/Home' xhtml design models:
    
        - Add Sponsors Advertisement.
    
        - Fix logo's image path.
        
        - Update table of content. Start using `dl' definition in lieu of
          `ul' definition.
    
        - Start using `class="title"' to control heading look an feel.
    
        - Start using h2 inside admonitions.
    
        - Rename Projects' tab to SIGs and Mirrors to Downloads.