Add a slot to show search tips

[eyeseast]

Closes #843

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	30.79%	6727 / 21843
🔵	Statements	30.79%	6727 / 21843
🔵	Functions	49.72%	274 / 551
🔵	Branches	75.65%	1013 / 1339

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/lib/components/forms/Search.svelte	0%	0%	0%	0%	1-77
src/lib/components/layouts/DocumentBrowser.svelte	0%	0%	0%	0%	1-2748

Generated in workflow #778 for commit 1b0a420 by the Vitest Coverage Report Action

[netlify]

✅ Deploy Preview for documentcloud-frontend ready!

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🔨 Latest commit	1b0a420
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Lighthouse	1 paths audited Performance: 55 Accessibility: 85 Best Practices: 92 SEO: 82 PWA: - View the detailed breakdown and full score reports

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Right-hand side of 'instanceof' is not an object /embed/documents/[id]-[slug] View Issue

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