Add scrollbar styles for light and dark modes

[tarunsinghofficial]

Description:

The current scrollbars in the docs don't look good or match the docs theme. To achieve the desired visual consistency and aesthetics across our project, I would like to enhance them across the whole site.

Issue fixed:

Enhancing the scrollbar in the entire docs to the matched theme i.e., dark colors for now.

Fixes #71

Changes done:

• Task 1

Screenshots/Videos

Before:

After:

✅️ By submitting this PR, I have verified the following

• Checked to see if a similar PR has already been opened 🤔️
• Reviewed the contributing guidelines 🔍️
• Tried squashing the commits into one

[aaronbrethorst]

this is definitely an improvement, but I see one regression that I want fixed: on a Mac with a trackpad, the scrollbars only appear when actively scrolling. That is no longer the case with this PR, and I'd like that contingency handled.

[aaronbrethorst]

great work; there's a merge conflict with index.css that will need to be fixed before merging though.

[tarunsinghofficial]

great work; there's a merge conflict with index.css that will need to be fixed before merging though.

Got it. Resolved the conflicts.

[aaronbrethorst]

👍