docs: add @Josh-Cena to the team

[Josh-Cena]

Motivation

Adding myself to the team members, as invited.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Preview:

[netlify]

✔️ [V2]

🔨 Explore the source changes: 1db28c1

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/617bb9e4fd21db0007895ffb

😎 Browse the preview: https://deploy-preview-5820--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	79
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5820--docusaurus-2.netlify.app/

[github-actions]

Size Change: -12 B (0%)

Total Size: 847 kB

ℹ️ View Unchanged

Filename	Size	Change
website/.docusaurus/globalData.json	38 kB	0 B
website/build/assets/css/styles.********.css	94 kB	0 B
website/build/assets/js/main.********.js	425 kB	0 B
website/build/blog/2017/12/14/introducing-docusaurus/index.html	68.2 kB	0 B
website/build/blog/index.html	39 kB	0 B
website/build/docs/index.html	46.1 kB	-6 B (0%)
website/build/docs/installation/index.html	53.6 kB	-6 B (0%)
website/build/index.html	31.6 kB	0 B
website/build/tests/docs/index.html	27.3 kB	0 B
website/build/tests/docs/standalone/index.html	23.8 kB	0 B

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[netlify]

✔️ [V2]

🔨 Explore the source changes: 1049db3

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/617bbae8aa7a1a0008dd71fc

😎 Browse the preview: https://deploy-preview-5820--docusaurus-2.netlify.app