fix(seo): give the landing page a descriptive document title

[shenxianpeng]

Why

The landing page's <title> is just Commit Check, and that's the headline Google shows. It doesn't say what the tool does. In Search Console (Sep 16–22):

query	impressions	clicks	position
commit check	8	0	4.6
check commit	5	0	5.6

What

• docs/overrides/main.html: on the homepage, use page.meta.seo_title when it's set, otherwise fall back to config.site_name as before.
• docs/index.md: seo_title: Commit Check — Commit message & branch name linter for Git

title: Commit Check is unchanged, so the social card and the search-index entry are unaffected. Other pages are unaffected.

Checked

SOCIAL_CARDS=false mkdocs build --strict passes.

• / → <title>Commit Check — Commit message & branch name linter for Git
• /getting-started/ → <title>Getting started - Commit Check (unchanged)

Summary by CodeRabbit

• Documentation
  • Updated the documentation homepage title for clearer search engine results. Non-homepage titles remain unchanged.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: e0ca16d9-e782-4bfd-b4a3-f0dbd3ca2b07

📥 Commits

Reviewing files that changed from the base of the PR and between d8fc686 and 1f97391.

📒 Files selected for processing (2)

• docs/index.md
• docs/overrides/main.html

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The documentation landing page now defines a page-level SEO title. The homepage title template uses that value when available and falls back to the site name.

Changes

Homepage title

Layer / File(s)	Summary
SEO title metadata and rendering docs/index.md, docs/overrides/main.html	The landing page sets seo_title to describe Commit Check. The homepage title template uses this value when set and falls back to config.site_name.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 1f973

This change targets the homepage document title while leaving its separate title metadata unchanged. No concrete user-facing regression is established in the reviewed changes, so no actionable merge blocker is identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a descriptive document title for the landing page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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