Sidebar auto expand (#3956)
Sidebar auto expand (#3956)

* Small fix for new_op page

* Create expandable sidebar

* Small fix

* rollback

* Automatically expand child level when clicking an entry

LinkHS/incubator-mxnet,Prasad9/incubator-mxnet,arank/mxnet,reminisce/mxnet,ptrendx/mxnet,yuruofeifei/mxnet,piiswrong/mxnet,smolix/incubator-mxnet,dmlc/mxnet,nicklhy/mxnet,Prasad9/incubator-mxnet,smolix/incubator-mxnet,saurabh3949/mxnet,sxjscience/mxnet,lxn2/mxnet,zhreshold/mxnet,sergeykolychev/mxnet,navrasio/mxnet,luoyetx/mxnet,precedenceguo/mxnet,pluskid/mxnet,reminisce/mxnet,Mega-DatA-Lab/mxnet,arank/mxnet,ForkedReposBak/mxnet,EvanzzzZ/mxnet,kkk669/mxnet,danithaca/mxnet,jamesliu/mxnet,hpi-xnor/BMXNet,Northrend/mxnet,apaleyes/mxnet,gautamkmr/incubator-mxnet,hpi-xnor/BMXNet,danithaca/mxnet,jermainewang/mxnet,jennyzhang0215/incubator-mxnet,ZihengJiang/mxnet,navrasio/mxnet,zhreshold/mxnet,tlby/mxnet,indhub/mxnet,thirdwing/mxnet,piiswrong/mxnet,luoyetx/mxnet,jiajiechen/mxnet,ZihengJiang/mxnet,yajiedesign/mxnet,Mega-DatA-Lab/mxnet,jiajiechen/mxnet,antoan2/incubator-mxnet,gautamkmr/incubator-mxnet,jamesliu/mxnet,piiswrong/mxnet,thirdwing/mxnet,lxn2/mxnet,EvanzzzZ/mxnet,formath/mxnet,jiajiechen/mxnet,rahul003/mxnet,madjam/mxnet,fullfanta/mxnet,formath/mxnet,nicklhy/mxnet,hesseltuinhof/mxnet,pluskid/mxnet,arikpoz/mxnet,kkk669/mxnet,pluskid/mxnet,xcgoner/dist-mxnet,precedenceguo/mxnet,arikpoz/mxnet,Ldpe2G/mxnet,Prasad9/incubator-mxnet,LinkHS/incubator-mxnet,gautamkmr/incubator-mxnet,Mega-DatA-Lab/mxnet,jennyzhang0215/incubator-mxnet,formath/mxnet,yajiedesign/mxnet,sxjscience/mxnet,kevinthesun/mxnet,weleen/mxnet,EvanzzzZ/mxnet,lxn2/mxnet,TuSimple/mxnet,gautamkmr/incubator-mxnet,CodingCat/mxnet,danithaca/mxnet,ptrendx/mxnet,sergeykolychev/mxnet,indhub/mxnet,ShownX/incubator-mxnet,crazy-cat/incubator-mxnet,thirdwing/mxnet,kevinthesun/mxnet,rishita/mxnet,crazy-cat/incubator-mxnet,likelyzhao/mxnet,hotpxl/mxnet,likelyzhao/mxnet,antoan2/incubator-mxnet,rishita/mxnet,nicklhy/mxnet,ShownX/incubator-mxnet,Ldpe2G/mxnet,stefanhenneking/mxnet,Guneet-Dhillon/mxnet,madjam/mxnet,smolix/incubator-mxnet,rahul003/mxnet,antoan2/incubator-mxnet,yuruofeifei/mxnet,CodingCat/mxnet,jiajiechen/mxnet,danithaca/mxnet,hesseltuinhof/mxnet,piiswrong/mxnet,jennyzhang0215/incubator-mxnet,eric-haibin-lin/mxnet,hpi-xnor/BMXNet,coder-james/mxnet,formath/mxnet,sxjscience/mxnet,leezu/mxnet,ForkedReposBak/mxnet,mbaijal/incubator-mxnet,sergeykolychev/mxnet,formath/mxnet,jamesliu/mxnet,Ldpe2G/mxnet,lxn2/mxnet,luoyetx/mxnet,wangyum/mxnet,jermainewang/mxnet,Guneet-Dhillon/mxnet,crazy-cat/incubator-mxnet,leezu/mxnet,yuruofeifei/mxnet,kevinthesun/mxnet,larroy/mxnet,fullfanta/mxnet,hpi-xnor/BMXNet,Prasad9/incubator-mxnet,saurabh3949/mxnet,vikingMei/mxnet,solin319/incubator-mxnet,weleen/mxnet,madjam/mxnet,jennyzhang0215/incubator-mxnet,zhreshold/mxnet,yajiedesign/mxnet,yajiedesign/mxnet,apache/incubator-mxnet,precedenceguo/mxnet,TuSimple/mxnet,gautamkmr/incubator-mxnet,jermainewang/mxnet,stefanhenneking/mxnet,kkk669/mxnet,kevinthesun/mxnet,luoyetx/mxnet,yajiedesign/mxnet,apache/incubator-mxnet,precedenceguo/mxnet,yuruofeifei/mxnet,apaleyes/mxnet,vikingMei/mxnet,TuSimple/mxnet,jermainewang/mxnet,yajiedesign/mxnet,arikpoz/mxnet,Prasad9/incubator-mxnet,ykim362/mxnet,zhreshold/mxnet,yajiedesign/mxnet,Guneet-Dhillon/mxnet,rahul003/mxnet,DR08/mxnet,hesseltuinhof/mxnet,wangyum/mxnet,saurabh3949/mxnet,crazy-cat/incubator-mxnet,solin319/incubator-mxnet,indhub/mxnet,larroy/mxnet,TuSimple/mxnet,navrasio/mxnet,leezu/mxnet,eric-haibin-lin/mxnet,pluskid/mxnet,ptrendx/mxnet,kkk669/mxnet,stefanhenneking/mxnet,arikpoz/mxnet,vikingMei/mxnet,arikpoz/mxnet,hotpxl/mxnet,tlby/mxnet,kkk669/mxnet,ykim362/mxnet,ykim362/mxnet,precedenceguo/mxnet,tlby/mxnet,ykim362/mxnet,hpi-xnor/BMXNet,CodingCat/mxnet,wangyum/mxnet,pluskid/mxnet,navrasio/mxnet,arikpoz/mxnet,larroy/mxnet,Northrend/mxnet,solin319/incubator-mxnet,saurabh3949/mxnet,EvanzzzZ/mxnet,tornadomeet/mxnet,rahul003/mxnet,DR08/mxnet,antoan2/incubator-mxnet,Mega-DatA-Lab/mxnet,tornadomeet/mxnet,jiajiechen/mxnet,rahul003/mxnet,tornadomeet/mxnet,jennyzhang0215/incubator-mxnet,rishita/mxnet,lxn2/mxnet,szha/mxnet,arikpoz/mxnet,tlby/mxnet,pluskid/mxnet,EvanzzzZ/mxnet,arank/mxnet,madjam/mxnet,tlby/mxnet,reminisce/mxnet,crazy-cat/incubator-mxnet,tlby/mxnet,dmlc/mxnet,Northrend/mxnet,hotpxl/mxnet,rahul003/mxnet,jennyzhang0215/incubator-mxnet,ykim362/mxnet,wangyum/mxnet,luoyetx/mxnet,dmlc/mxnet,vikingMei/mxnet,dmlc/mxnet,hesseltuinhof/mxnet,ZihengJiang/mxnet,jamesliu/mxnet,solin319/incubator-mxnet,arank/mxnet,apaleyes/mxnet,smolix/incubator-mxnet,solin319/incubator-mxnet,ptrendx/mxnet,mbaijal/incubator-mxnet,TuSimple/mxnet,ShownX/incubator-mxnet,Prasad9/incubator-mxnet,apaleyes/mxnet,kevinthesun/mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,ShownX/incubator-mxnet,Ldpe2G/mxnet,jermainewang/mxnet,Mega-DatA-Lab/mxnet,szha/mxnet,szha/mxnet,rahul003/mxnet,CodingCat/mxnet,reminisce/mxnet,solin319/incubator-mxnet,DR08/mxnet,hpi-xnor/BMXNet,piiswrong/mxnet,smolix/incubator-mxnet,zhreshold/mxnet,fullfanta/mxnet,ZihengJiang/mxnet,indhub/mxnet,xcgoner/dist-mxnet,thirdwing/mxnet,zhreshold/mxnet,luoyetx/mxnet,stefanhenneking/mxnet,crazy-cat/incubator-mxnet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