docs: improve image customization guidance and clean up broken links #489
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This PR includes the following documentation improvements:
Added image customization guidance
Introduced a new subsection under “Image styling” that explains how to override the default image rendering using raw HTML for tall, narrow, or awkwardly displayed images.
Removed broken links and fragile code file URLs
Cleaned up outdated or fragile hyperlinks, especially those pointing directly to GitHub files or anchors that are prone to 404 errors. Replaced them with plain text file paths where appropriate.
Refactored the Documentation Style Guide section
Slightly restructured and clarified the “Overriding theme styles”.