Update accordion.ctp

Fix: Warning (512): Method RegionsHelper::accordion does not exist [CORE/Cake/View/Helper.php, line 191]
Fix the accordion block error
Fix the brand link in the theme
Upgrade the theme to the latest bootstrap version
Upgrade the theme to the latest bootstrap version
Applied a new form style
Change background color of header
Change background color of header active
Change header colors
Add Composer file
Change theme name
Include missing JavaScript files
Remove unnecessary CSS
Rename the composer theme name