[docs] Rename mini to best practices (#21566)

Rename "mini-examples" to "best practices"

## Summary & Motivation

## Test Plan

## Changelog

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Internal-RevId: ed54e2b711a71c6dd6c71f942659fb636bf6e049

Author: dehume

…mini-examples/asset-health-monitoring.md …est-practices/asset-health-monitoring.mddocs/docs/examples/mini-examples/asset-health-monitoring.md renamed to docs/docs/examples/best-practices/asset-health-monitoring.md docs/docs/examples/mini-examples/asset-health-monitoring.md renamed to docs/docs/examples/best-practices/asset-health-monitoring.md

@@ -1,8 +1,8 @@
 ---
-title: Mini examples
+title: Best practices
 description: Short, practical examples of Dagster usage
-canonicalUrl: '/examples/mini-examples'
-slug: '/examples/mini-examples'
+canonicalUrl: '/examples/best-practices'
+slug: '/examples/best-practices'
 sidebar_class_name: hidden
 hide_title: true
 ---