add preview of resume pdf, update resume

Author: Keyu-He

_layouts/cv.liquid

@@ -68,6 +68,14 @@ layout: default
     </header>
 
     <article>
+      {% if page.cv_pdf %}
+        <div class="card mt-3 p-3">
+          <h3 class="card-title font-weight-medium">Resume Preview</h3>
+          <div>
+            <embed src="{{ page.cv_pdf | prepend: 'assets/pdf/' | relative_url }}" type="application/pdf" width="100%" height="800px" style="border: none;" />
+          </div>
+        </div>
+      {% endif %}
       <div class="cv">
         {% for data in site.data.resume %}
           {% if site.jsonresume and site.jsonresume.size > 0 %}