Standardized RELAY across the docs

[Manny-r31]

Documentation Update Pull Request

Description

Standardized RELAY across the docs in every instance that was public facing

Related Issue

#690

Type of Change

• Update to existing documentation

Documentation Change Details

• Went through and changed all instances of the word Relay -> RELAY
• exception was made for versioned docs, as I will have to create a new PR for that. It is 248 different files which require changes for versioned docs.

Motivation and Context

Solves #690

Checklist:

• My documentation follows the style guidelines of this project
• I have performed a self-review of my documentation
• My changes generate no new warnings
• Builds successfully locally

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Lighthouse	1 paths audited Performance: 29 (🔴 down 7 from production) Accessibility: 91 (no change from production) Best Practices: 92 (no change from production) SEO: 89 (no change from production) PWA: - View the detailed breakdown and full score reports

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