Standardize Page Titles

[MeenuyD]

Updated page titles in the docs to follow the format: Group: Page (e.g., Triggers: Introduction, React Hooks: Overview).
Added sidebarTitle field to the markdown frontmatter to retain the original sidebar group titles while displaying the updated page titles.
#527

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Latest commit: da0adf0

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[ericallam]

The issue was for all docs pages with titles like "Overview" and "Introduction", but this PR only changes 2 of them. There's another PR open that I'm going to accept but I appreciate your attempt 👍