Made sure all .columns have height

Made sure all .columns have height and set <h1> margin top to 0.
Cleaning up the main menu and other styles

Changing the “open” height to 40px from 50px when “closed”. Reducing
the <h1> font size to 1.9rem.
Added 'filters' includes file and submenu filter

Added 'filters' includes folder and file. Added ‘wp_nav_menu_objects’
filter to display a menu’s submenu items.
Added "include footer body template"

Added get_termplate_part( ‘footer-body’ ) to get the footer content.