Update scholar author to Lei Geng and bold emphasized publication authors

[leigeng1997]

Motivation

• Replace placeholder scholar author entries with the actual site owner and improve the visual weight of emphasized author names in the publications list.

Description

• Change scholar name fields in _config.yml from last_name: [Einstein] / first_name: [Albert, A.] to last_name: [Geng] / first_name: [Lei, L.], remove an extra trailing space after baseurl:, and add font-weight: 700 to the > em selector in _sass/_publications.scss so emphasized authors appear bold.

Testing

• No automated tests were run for this change.

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Codex Task

[github-actions]

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