Add “Configure” link on Extend page and show README via hook_help (no routes)

Problem/Motivation
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On the Extend page (/admin/modules), the module row has no “Configure” link, so admins search manually for settings.
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The project has a README.md, but there is no in-site Help page. We want the Help integration to render the README content via hook_help() (no extra routes).
Proposed resolution
1)
Add a configuration link on the module row (Extend page):
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In myrest_seo.info.yml, set:
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configure: myrest_seo.settings (route already exists).
2)
Implement hook_help() in myrest_seo.module to render README:
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Implement myrest_seo_help(string $route_name, \Drupal\Core\Routing\RouteMatchInterface $route_match).
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When $route_name === 'help.page.myrest_seo', load README.md from the module root and render its (sanitized) Markdown/lines as help content.
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If README.md is not available in the runtime (e.g., stripped in prod), show a concise fallback with links to:
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/admin/seo (dashboard)
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/admin/seo/settings (Front domain)
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/admin/seo/redirects (Redirect rules)
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Robotstxt settings (linked through the existing redirect entry)
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No custom routes are introduced — only hook_help().
3)
Keep README focused (Overview, Requirements, Configuration paths, Redirect rules, Robots extras/front domain). Help mirrors the same sections.