Removed `satus_get_search_form()`, `Satus_Nav_Walker` and `Satus_Navbar_Waker` function from `cleanup.php`.
Removed reference to walker class in `header.php`.
Placed contents in `wrapper.php` and deleted file.
Removed reference to template `sidebar.php`.
Added `searchform.php` file and referenced the template part.
Updates to head.