chore(codeowners): add DevEx as code owners of the GitHub pages site

[ericcrosson-bitgo]

Closes Ticket: DX-1103

DevEx is currently working to improve the website and associated
documentaiton. Adding them as code owners allows our technical writers
to review changes effectively.

[github-actions]

🎉 This PR is included in version @api-ts/typed-express-router@2.0.0-beta.1 🎉

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🎉 This PR is included in version @api-ts/express-wrapper@2.0.0-beta.1 🎉

The release is available on npm package (@beta dist-tag)

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🎉 This PR is included in version @api-ts/typed-express-router@1.1.14 🎉

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🎉 This PR is included in version @api-ts/express-wrapper@1.0.34 🎉

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[github-actions]

🎉 This PR is included in version @api-ts/superagent-wrapper@1.3.4 🎉

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[github-actions]

🎉 This PR is included in version @api-ts/openapi-generator@5.8.0 🎉

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