To redo the menu on the website

Good day.
Have a website – all-grain.ru
1. Left categories menu is now implemented so that closing/opening it reloads the page.
You need to make it so that the menu is opened/closed via js without reloading the page.
2. Horizontal main menu – need to make the size of points across the width changed depending on the number of these points, that is, to any number of menu items they horizontally took the entire length of the menu.

Price terms?