chore: Remove references to mdn/interactive-examples repo

[bsmth]

Description

Removes a few obsolete references

Motivation

Housekeeping, part of:

• Archive interactive-examples repository fred#616

[github-actions]

Preview URLs

• /en-US/docs/Web/CSS/::cue
• /en-US/docs/Web/CSS/background-position-x
• /en-US/docs/Web/CSS/background-position-y

External URLs (4)

URL: /en-US/docs/Web/CSS/background-position-x
Title: background-position-x

• https://drafts.csswg.org/css-backgrounds-4/ (1 time)
• https://drafts.csswg.org/css-values-4/ (1 time)

---

URL: /en-US/docs/Web/CSS/background-position-y
Title: background-position-y

• https://drafts.csswg.org/css-backgrounds-4/ (1 time)
• https://drafts.csswg.org/css-values-4/ (1 time)