resolves #17 update logo

resolves #17 (closed)

pages/_layouts/main.njk

@@ -166,7 +166,7 @@
   <div class="asciidoc">
     <div class="category brand">
       <div class="logo">
-        <img src="./assets/img/asciidoc-horizontal-white-r.svg" alt="AsciiDoc&reg; Logo" />
+        <img src="./assets/img/asciidoc-horizontal-white-tm.svg" alt="AsciiDoc&reg; Logo" />
       </div>
     </div>
     <div class="category work">