remove download options

docs/index.html

@@ -23,7 +23,7 @@
 <meta name="author" content="Luc Anselin" />
 
 
-<meta name="date" content="2023-08-18" />
+<meta name="date" content="2023-08-21" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <meta name="apple-mobile-web-app-capable" content="yes" />
@@ -979,7 +979,7 @@ <h1>
 <h1 class="title">An Introduction to Spatial Data Science with GeoDa</h1>
 <h2 class="subtitle"><em>Volume 1: Exploring Spatial Data</em></h2>
 <p class="author"><em>Luc Anselin</em></p>
-<p class="date"><em>2023-08-18</em></p>
+<p class="date"><em>2023-08-21</em></p>
 </div>
 <div id="preface" class="section level1 unnumbered hasAnchor">
 <h1>Preface<a href="index.html#preface" class="anchor-section" aria-label="Anchor link to header"></a></h1>
@@ -1040,7 +1040,7 @@ <h1>Preface<a href="index.html#preface" class="anchor-section" aria-label="Ancho
 "link": null,
 "text": null
 },
-"download": ["geodabookvol1.pdf", "geodabookvol1.epub"],
+"download": null,
 "search": {
 "engine": "fuse",
 "options": null