Adding missing page titles

[travjenkins]

Changes

https://github.com/estuary/marketing-site/issues/243

• Added the Header export on the three pages

Tests / Screenshots

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 6f99e20):

https://estuary-marketing--pr291-travjenkins-seo-addi-x5evjqyi.web.app

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