fix article titles and simplify listings

[LjyYano]

What changed

• disable automatic title inference from the first Markdown heading
• keep the existing filename fallback for all article titles
• remove the decorative hero from the archive page
• remove the decorative hero from all six category pages
• keep filters, article counts, and article lists intact

Root cause

GitHub Pages loads jekyll-titles-from-headings, which populated page.title from the first heading when front matter had no title. Many articles begin with # 前言, so their filenames were incorrectly replaced by 前言 in lists and article pages.

Validation

• Jekyll YAML configuration parses and disables titles_from_headings
• Liquid 4 strict parsing passes for the archive and category templates
• git diff --check passes

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore a visible top-level heading

After removing the hero, /archive/ and all pages using the category layout no longer render an <h1>; the archive outline starts at its year <h2> elements and category pages start at article <h2> elements. This removes the visible page identity and the top-level landmark used by heading navigation, especially for users opening a listing directly, so retain a compact page heading when simplifying the decorative hero.

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