Remove duplicate H1s and sync frontmatter titles

[mintlify]

Removes explicit # H1 headings from pages that already declare a title in frontmatter. Where the H1 text differed from the frontmatter title, the frontmatter title is updated to the H1 text (trailing {#anchor} syntax stripped).

• 117 files updated
• mint validate and mint broken-links both pass

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Note

Low Risk
Documentation-only MDX edits with no runtime or API impact; minor risk of nav/title wording changes where frontmatter was updated.

Overview
This PR standardizes how doc pages declare their main heading by using frontmatter title only and removing redundant markdown # H1s across ~117 MDX files (concepts, guides, integrations, Cloud, reference, support KB, snippets).

Where an in-body H1 disagreed with frontmatter—often generic values like Overview or HTTP interface—title is updated to match the former H1 text, with {#anchor} suffixes stripped. A few pages now use section-specific titles (e.g. Splunk Installation, CopilotKit Run the application, chDB Python DataFrame with mixed JSON objects) instead of duplicating the page topic in an H1.

No product or API behavior changes—only docs structure and displayed/nav titles.

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