Add and remove boostra squashed commit

To reduce branch size as bootstrap is huge

add default bootstrap theme
does not import code in bootstrap
remove bootstrap

IPython/frontend/html/notebook/static/less/style.less

@@ -4,3 +4,4 b''
 @import "renderedhtml.less";
 @import "tooltip.less";
 @import "variables.less";
+@import "../components/bootstrap/less/bootstrap";