Add max-height and scroll functionality to sidebar

[JohnOlshea]

Problem:
The sidebar currently does not have a max-height set, and the content is not scrollable. This causes an issue when there are a large number of menu items, as the content overflows off-screen. As a result, users cannot see or interact with menu items that extend below the screen size.

Proposed Solution:
To address this issue, I propose adding a max-height to the sidebar and enabling scroll functionality. This will ensure that the sidebar is limited in height and allows users to scroll through the menu items.

Screenshots:
Before:

After: