Add HR_PAGE.md fixture
Add HR_PAGE.md fixture

This is for testing that non exercise sections are merged correctly
together and united with HRs

hujianfei1989/gitbook,jasonslyvia/gitbook,qingying5810/gitbook,escopecz/documentation,sunlianghua/gitbook,a-moses/gitbook,justinleoye/gitbook,bradparks/gitbook,intfrr/gitbook,athiruban/gitbook,2390183798/gitbook,hongbinz/gitbook,palerdot/gitbook,guiquanz/gitbook,tzq668766/gitbook,bjlxj2008/gitbook,ZachLamb/gitbook,svenkatreddy/gitbook,JohnTroony/gitbook,OriPekelman/gitbook,gdbooks/gitbook,boyXiong/gitbook,ryanswanson/gitbook,codepiano/gitbook,mruse/gitbook,gencer/gitbook,youprofit/gitbook,qingying5810/gitbook,grokcoder/gitbook,CN-Sean/gitbook,ShaguptaS/gitbook,youprofit/gitbook,FKV587/gitbook,alex-dixon/gitbook,sudobashme/gitbook,ShaguptaS/gitbook,bjlxj2008/gitbook,JohnTroony/gitbook,shibe97/gitbook,tshoper/gitbook,JozoVilcek/gitbook,vehar/gitbook,Keystion/gitbook,codepiano/gitbook,sudobashme/gitbook,gencer/gitbook,xiongjungit/gitbook,strawluffy/gitbook,boyXiong/gitbook,alex-dixon/gitbook,jocr1627/gitbook,OriPekelman/gitbook,mruse/gitbook,rohan07/gitbook,anrim/gitbook,webwlsong/gitbook,tzq668766/gitbook,guiquanz/gitbook,lucciano/gitbook,grokcoder/gitbook,bradparks/gitbook,iamchenxin/gitbook,palerdot/gitbook,kamyu104/gitbook,yaonphy/SwiftBlog,xiongjungit/gitbook,xxxhycl2010/gitbook,gaearon/gitbook,xcv58/gitbook,gdbooks/gitbook,rohan07/gitbook,shibe97/gitbook,lucciano/gitbook,vehar/gitbook,FKV587/gitbook,kamyu104/gitbook,mautic/documentation,ferrior30/gitbook,mautic/documentation,athiruban/gitbook,npracht/documentation,tshoper/gitbook,snowsnail/gitbook,Abhikos/gitbook,iamchenxin/gitbook,jasonslyvia/gitbook,a-moses/gitbook,ferrior30/gitbook,svenkatreddy/gitbook,wewelove/gitbook,snowsnail/gitbook,xxxhycl2010/gitbook,minghe/gitbook,justinleoye/gitbook,haamop/documentation,hongbinz/gitbook,wewelove/gitbook,sunlianghua/gitbook,jocr1627/gitbook,GitbookIO/gitbook,nycitt/gitbook,iflyup/gitbook,intfrr/gitbook,ZachLamb/gitbook,iflyup/gitbook,CN-Sean/gitbook,megumiteam/documentation,megumiteam/documentation,gaearon/gitbook,xcv58/gitbook,minghe/gitbook,2390183798/gitbook,escopecz/documentation,haamop/documentation,npracht/documentation,hujianfei1989/gitbook,nycitt/gitbook,webwlsong/gitbook,thelastmile/gitbook,thelastmile/gitbook,switchspan/gitbook,switchspan/gitbook