added pdf viewer and optimizations

public/pdfjs/web/images/annotation-note.svg

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   width="40"
+   height="40"
+   viewBox="0 0 40 40">
+  <rect
+     width="36.075428"
+     height="31.096582"
+     x="1.962286"
+     y="4.4517088"
+     id="rect4"
+     style="fill:#ffff00;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.23004246;stroke-opacity:1" />
+  <rect
+     width="27.96859"
+     height="1.5012145"
+     x="6.0157046"
+     y="10.285"
+     id="rect6"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+  <rect
+     width="27.96859"
+     height="0.85783684"
+     x="6.0157056"
+     y="23.21689"
+     id="rect8"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+  <rect
+     width="27.96859"
+     height="0.85783684"
+     x="5.8130345"
+     y="28.964394"
+     id="rect10"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+  <rect
+     width="27.96859"
+     height="0.85783684"
+     x="6.0157046"
+     y="17.426493"
+     id="rect12"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+</svg>