[https://github.com/tracim/tracim/issues/757] workspace can now be created from any page

frontend/src/container/Sidebar.jsx

     this.props.history.push(PAGE.WORKSPACE.CONTENT_LIST(idWs))
   }
 
+  // @DEPRECATED
   // not used, right now, link on sidebar filters is a <Link>
   handleClickContentFilter = (idWs, filter) => {
     const { workspace, history } = this.props

frontend/src/container/Tracim.jsx

           <Route path={'/wip/:cp'} component={WIPcomponent} /> {/* for testing purpose only */}
 
           <div id='appFeatureContainer' />
+          <div id='popupCreateContentContainer' />
         </div>
 
       </div>

frontend/src/container/WorkspaceContent.jsx

           </PageTitle>
 
           <PageContent parentClass='workspace__content'>
-            <div id='popupCreateContentContainer' />
-
             <div className='workspace__content__fileandfolder folder__content active'>
               <ContentItemHeader />