https://github.com/tracim/tracim/issues/681, remove the breadcrumb on the header

frontend/src/container/Header.jsx

         <nav className='navbar navbar-expand-md navbar-light bg-light'>
           <Logo logoSrc={logoHeader} onClickImg={this.handleClickLogo} />
 
-          <div className='header__breadcrumb d-none d-lg-block ml-4'>
-            Dev Tracim - liste des contenus
-          </div>
+          { /*
+            <div className='header__breadcrumb d-none d-lg-block ml-4'>
+              Dev Tracim - liste des contenus
+            </div>
+          */ }
 
           <NavbarToggler />