Enlarge Jupyter logo to 28px height

IPython/html/static/base/less/variables.less

@@ -9,7 +9,7 b''
 @blockquote-font-size: inherit;
 @modal-inner-padding: 15px;
 @grid-float-breakpoint: 540px;
-@logo_height: 24px;
+@logo_height: 28px;
 
 // Disable modal slide-in from top animation.
 .modal {

IPython/html/static/style/style.min.css

@@ -7784,8 +7784,8 b' div#header .header-bar {'
 }
 #ipython_notebook {
   padding-left: 0px;
-  padding-top: 3px;
-  padding-bottom: 3px;
+  padding-top: 1px;
+  padding-bottom: 1px;
 }
 #noscript {
   width: auto;
@@ -7797,7 +7797,7 b' div#header .header-bar {'
   font-weight: bold;
 }
 #ipython_notebook img {
-  height: 24px;
+  height: 28px;
 }
 #site {
   width: 100%;