fix: header blank in serve mode due to INI whitespace and unguarded githubRepository

[Mpdreamz]

Summary

• SoftCircuits.IniFileParser preserves leading whitespace from INI values, so reading url = git@github.com:org/repo.git from .git/config yielded " git@github.com:..." (space-prefixed). NormalizeToGitHubPath's StartsWith("git@github.com:") check then failed silently, making GitHubRepository null locally.
• Razor null-suppression meant <elastic-docs-header> received no github-repository HTML attribute, so r2wc passed undefined to the React component.
• getDeploymentLinks called githubRepository.includes('/') unconditionally, throwing a TypeError that crashed React's render silently and left the entire header blank in serve mode.

Fix (3 changes):

• GitCheckoutInformationFactory.cs: add .Trim() to the URL value read from the INI file — consistent with the existing .Trim() already applied to remoteName.
• DeploymentInfo.tsx: make githubRepository optional; guard getDeploymentLinks and the Repository row against undefined.
• Header.tsx: make githubRepository and githubLink optional to match reality (Razor omits them when null).

Test plan

• Run dotnet run --project src/tooling/docs-builder -- serve locally; confirm the header renders with branch/commit button visible
• Confirm the deployment info popover shows Branch, Commit, and Repository rows
• Verify no TypeScript errors: npm run compile:check in src/Elastic.Documentation.Site

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: f1814659-3236-4156-ba21-09eb66934706

📥 Commits

Reviewing files that changed from the base of the PR and between 46d3697 and 3b0eb91.

📒 Files selected for processing (3)

• src/Elastic.Documentation.Site/Assets/web-components/Header/DeploymentInfo.tsx
• src/Elastic.Documentation.Site/Assets/web-components/Header/Header.tsx
• src/Elastic.Documentation.Tooling/GitCheckoutInformationFactory.cs

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/github-repository-null-ini-whitespace

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