Docs: Prevent layout shift caused by Carbon ads

[julien-deramond]

After the documentation migration, it's been noted that the Carbon Ads still cause a layout shift when they load, which can be a bit distracting. This issue actually existed before the migration as well, but it's worth revisiting to improve the overall user experience.

One possible solution could be to reserve space for the ad container ahead of time to prevent content from shifting during load.

To reproduce, one can go to https://getbootstrap.com/docs/5.3/components/button-group/ for instance.

[PierBover]

Should be simple enough to add a min-height: 100px here:

bootstrap/site/src/scss/_ads.scss

Line 7 in 06f4e79

#carbonads {

[julien-deramond]

I haven't checked yet, but that could work if the ads always have the same height.
If you're up for it @PierBover, feel free to open a PR — we'd really appreciate the contribution!

[PierBover]

Sure!

[PierBover]

Here it is. I hope it's all clear and haven't done anything weird!

#41452