Fix : whitespaces between the main content and progressive sidebar (scroll issue)

[TenzDelek]

URL:

https://nodejs.org/en/learn/getting-started/how-to-install-nodejs

Browser Name:

brave

Browser Version:

1.65.123

Operating System:

Windows 11

How to reproduce the issue:

current behavior of the website scroll is base on such that the sidebar and the main content are being dependent on each other when scrolling , leaving a huge whitespace for some long main content. this issue was raised in the following pr Issue Link by @AugustinMauroy .

i believe the scroll behavior of both should be independent like our previous version before that pr was merge.

[amyy2]

Hello, can I take on this issue?

[RedYetiDev]

PRs are always welcome