Remove 3.9 and 3.8 from version selector (#773)

Author: Simran-B

site/themes/arangodb-docs-theme/layouts/partials/version-selector.html

@@ -4,7 +4,5 @@
     {{ range $i, $version := $versions }}
         <option value="{{ $version.name }}">{{ $version.name }}</option>
     {{ end }}
-        <option value="3.9">3.9</option>
-        <option value="3.8">3.8</option>
     </select>
 </div>

site/themes/arangodb-docs-theme/static/js/theme.js

@@ -414,25 +414,12 @@ function setVersionSelector(version) {
   }
 }
 
-function handleOldDocsVersion(version) {
-    var legacyUrl = "https://www.arangodb.com/docs/" + version + "/";
-    var handle = window.open(legacyUrl, "_blank");
-    if (!handle) window.location.href = legacyUrl;
-    return;
-}
-
 function getCurrentVersion() {
   var urlVersion = stableVersion.name
 
   if (window.location.pathname.split("/").length > 0) {
     newVersion = getVersionFromURL()
 
-    if (newVersion === "3.8" || newVersion === "3.9") {
-      handleOldDocsVersion(newVersion)
-      versionSelector.value = urlVersion;
-      return;
-    }
-
     if (getVersionInfo(newVersion) == undefined) {
       loadNotFoundPage();
       return;
@@ -451,12 +438,6 @@ function changeVersion() {
     var versionSelector = document.getElementById("arangodb-version");
     var newVersion  = versionSelector.options[versionSelector.selectedIndex].value;
 
-    if (newVersion === "3.8" || newVersion === "3.9") {
-        handleOldDocsVersion(newVersion)
-        versionSelector.value = oldVersion;
-        return;
-    }
-
     try {
         localStorage.setItem('docs-version', newVersion);
         renderVersion();