Update icons-emojis.md

[bartdorlandt]

Fixing the pumping heart in div

[bartdorlandt]

It might require more changes:

mkdocs-material/src/overrides/assets/stylesheets/custom/_typeset.scss

Lines 85 to 87 in caeb33e

	.mdx-heart {
	animation: heart 1000ms infinite;
	}

Here it is actually defined as .mdx-heart, and not as .heart as the example.
So perhaps some clarifying text is needed, or more files require changing.

Don't know if that will break something else. I therefore did not change it.

[bartdorlandt]

I messed up. Please ignore.