Move logo into images/

Prepping for more images.
diff --git a/content/annotator-logo.svg b/content/images/annotator-logo.svg
similarity index 100%
rename from content/annotator-logo.svg
rename to content/images/annotator-logo.svg
diff --git a/content/index.html b/content/index.html
index 980a034..ff83703 100644
--- a/content/index.html
+++ b/content/index.html
@@ -9,7 +9,7 @@
     <meta property="og:title" content="Apache Annotator" />
     <meta property="og:type" content="website" />
     <meta property="og:url" content="https://annotator.apache.org/" />
-    <meta property="og:image:url" content="https://annotator.apache.org/annotator-logo.svg" />
+    <meta property="og:image:url" content="https://annotator.apache.org/images/annotator-logo.svg" />
     <meta property="og:image:alt" content="Apache Annotator (incubating) logo" />
 
     <link rel="alternate" title="DOAP" href="doap.rdf" type="application/rdf+xml" />
@@ -21,7 +21,7 @@
     <div class="ui borderless stackable top attached main menu">
       <div class="ui container">
         <a class="item" href="/" style="color: rgba(0,0,0,.87);">
-          <img class="ui small image" src="annotator-logo.svg" alt="Apache Annotator (incubating)" />
+          <img class="ui small image" src="images/annotator-logo.svg" alt="Apache Annotator (incubating)" />
         </a>
 
         <div class="right menu">