Update and rename about-github-certifications.md to about-github-cert…

[gutierrezashleyy03-cmd]

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Source	Review	Production	What Changed
New file: get-started/showcase-your-expertise-with-github-certifications/about-github-certifi.md
Removed: get-started/showcase-your-expertise-with-github-certifications/about-github-certifications.md	n/a	fpt ghec	removed

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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