feat(sonic): updating oss front page

[akristen]

Added 1 sentence in the intro content to docs site

[gatsby-cloud[bot]]

:white_check_mark: opensource-website-develop deploy preview ready

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• Performance 31 :orange_circle: · Accessibility 82 :orange_circle: · Best Practices 92 :green_heart: · SEO 92 :green_heart: — View full report

[nr-opensource-bot]

:tada: This PR is included in version 1.23.0 :tada:

The release is available on GitHub release

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