Scrollbar For Sidebar: If the sidebar doesn't fully fit on the screen

[nik-rev]

Checks

• [X] I have thoroughly read and understand The Odin Project Contributing Guide
• [X] The title of this issue follows the Feature Request: brief description of feature request format, e.g. Feature Request: Add a dark mode to the website
• [ ] Would you like to work on this issue?

Description of the Feature Request

Discussed in detail in #27401

But for summary, when there are too many sections the sidebar overflows and it's impossible to fully view every section in the sidebar until the user scrolls to the very bottom. This should be fixed that if there are too many headings and the navigation bar doesn't fully fit on the screen, it should have a scrollbar.

Acceptance criteria

• [ ] Scrollbar for the nav when there are too many sections and it doesn't fit on the screen

Additional Comments

No response

[KevinMulhern]

Thanks @nikitarevenco, there might be something else we could do besides a scrollbar. I'd like to explore our options with this before opening it up to be worked on.