Handbook Hamburger menu should change to a close icon when open

[kajalgohel]

When we open the meta handbook, meta trac, meta projects pages in meta module the hamburger menu is not shown. I fixed the position of menu, but the issue is there should be close icon display for close the menu.

[kajalgohel]

before set the position of hamburger menu

[kajalgohel]

After set the position of hamburger menu

[kajalgohel]

after adding close icon for close the menu

[dd32]

See #6096 for the menu positioning.

[coffee2code]

In 12901:

Breathe: Show 'X' icon instead of hamburger when secondary nav popup is shown.

Props kajalgohel, coffee2code.
Fixes #6113.

[coffee2code]

#6470 was marked as a duplicate.