fix: phantom scroll when params.footer.enable is set to false

[Zabriskije]

When params.footer.enable is set to false, it causes a phantom scroll effect (more visible on pages with little content). Here's a preview:

The problem is --menu-height: 3.75rem, but just setting it to --menu-height: 3.8rem fixes the issue.

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[imfing]

let me look into this, this might actually be a small bug

[imfing]

turns out the sidebar bottom menu container was calculated to 61 pixels in the browser, while 3.75rem is 60 pixels. so the total height of sidebar exceeds the view height by 1 pixel

i updated your PR to put a limit to the sidebar bottom container.

[imfing]

thanks for spotting this.