Remove the hamburger icon and change the color of buttons

- The hamburger icon (three lines icon) has no functionality on the page and is therefore, not needed.

- The border color of the "Join the Discord Server" button can be changed to white or a light grey but on hovering, the yellow can remain as it is currently.

- The color of the navbar items after the click, can be made better, my suggestion would be a white background for each item with a border radius of 4px.