Adding Red Hat brandings

* tab and logos

had to change the positioning.


This works,  moves the nav down(testing in the chrome dev tools):


    #main-header nav {
        display: inline-block;
        right: 0;
        margin-top: 20px; 
        background-color: #f2f2f2;
        border-top: 1px solid #dadada;
        border-bottom: 1px solid #dadada;
        width: 100%;
    }