Update Observability Best Practices section

[leslie-lau]

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Pull Request Overview

This PR restructures the documentation by creating a dedicated Observability section and reorganizing the best practices hierarchy. The Datadog RUM documentation is moved into the new observability subdirectory, and terminology is standardized throughout.

Key Changes:

• Created a new "Observability" category section with a dedicated folder structure
• Moved Datadog RUM documentation into the observability subdirectory and updated its title/metadata
• Renumbered sidebar positions across 7 documentation files to accommodate the new organizational structure
• Added redirect from old path to new observability path

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/best-practices/observability/category.yml	New category configuration file defining the Observability section at position 4 with icon and description
docs/best-practices/observability/datadog-rum.md	Renamed and reorganized into observability folder; standardized terminology (Variable, Feature Flag) and added code formatting with backticks
docs/best-practices/tech-debt.md	Updated sidebar position from 6 to 8 to accommodate new structure
docs/best-practices/migration.md	Updated sidebar position from 6 to 7 to accommodate new structure
docs/best-practices/feature-grouping.md	Updated sidebar position from 4 to 5 to accommodate new structure
docs/best-practices/effectively-organizing-feature-flags.md	Updated sidebar position from 5 to 6 to accommodate new structure
docs/best-practices/continuous-deployment.md	Updated sidebar position from 7 to 9 to accommodate new structure
docs/best-practices/engineering-led-experiments.md	Updated sidebar position from 9 to 10 to accommodate new structure
docs/best-practices/product-led-experimentation.md	Updated sidebar position from 10 to 11 to accommodate new structure
_redirects	Added 301 redirect from old datadog-rum path to new observability subdirectory path

Comments suppressed due to low confidence (1)

docs/best-practices/observability/datadog-rum.md:13

• The URL in this line contains a capitalization inconsistency. The domain should be datadoghq.com (all lowercase) rather than Datadoghq.com. URLs are case-sensitive and the canonical domain is lowercase.

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