BD-3089 Create includes file for metrics

[rachel-feinberg]

Summary

My PR creates an includes file that contains metrics definitions, and inserts the include tag throughout the Docs site.

Related PRs, issues, or features (optional)

BD-3089

Feature release date (optional)

• N/A

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
braze-docs-ko	⬜️ Ignored (Inspect)	Visit Preview		Oct 15, 2024 5:22pm

[bre-fitzgerald]

Did a spot check of most of the pages and looks like everything is rendering as expected. Lgtm!

[lydia-xie]

Left 2 comments for your review!

[lydia-xie]

Suggested change

	---
	<style>
	.calculation-line {
	color: #76848C;
	font-size: 14px;
	}
	</style>
	=======
	---
	<style>
	.calculation-line {
	color: #76848C;
	font-size: 14px;
	}
	</style>
	=======

@rachel-feinberg I think this area might've broken the page

[lydia-xie]

amazing work as always, thanks for tackling this task 😎