[Website] Improve doc titles and sync missed content

[tobias-tengler]

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[Copilot]

Pull request overview

This PR updates the website docs to improve page titles (including SEO/OG titles) and fills in/refreshes documentation content, particularly around Fusion field-selection arguments and Hot Chocolate directives/introspection.

Changes:

• Added optional metaTitle frontmatter support and used it in docs generateMetadata() for better SEO/browser tab titles without changing on-page headings.
• Updated multiple docs index pages’ title (and added metaTitle where beneficial) plus several doc content improvements (Fusion key/selection arguments, Hot Chocolate directive definitions, opt-in wording).
• Minor UI/content tweaks: logo cloud logos now link to company sites; mobile nav item styling adjusted.

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/src/helpers/readFrontmatter.ts	Extends doc frontmatter typing with metaTitle.
website/app/docs/[...slug]/page.tsx	Uses metaTitle to override computed docs metadata title.
website/src/components/MobileNav.tsx	Adjusts mobile menu link classes (removes hover/transition styles).
website/src/components/home/LogoCloud.tsx	Wraps enterprise logos with external links and accessibility labels.
website/content/docs/strawberryshake/index.md	Updates doc title and adds metaTitle.
website/content/docs/skillz/index.md	Updates doc title and adds metaTitle.
website/content/docs/nitro/index.md	Updates doc title, adds metaTitle, removes Slack callout.
website/content/docs/mocha/index.md	Updates doc title and adds metaTitle.
website/content/docs/mocha/mediator/index.md	Renames section title from “Overview” to “Mediator”.
website/content/docs/mocha/sagas.md	Replaces em-dash punctuation and table placeholders with hyphen formatting.
website/content/docs/hotchocolate/index.md	Updates doc title and adds metaTitle.
website/content/docs/hotchocolate/server/index.md	Renames section title to “Server”.
website/content/docs/hotchocolate/security/index.md	Renames section title to “Securing Your API”.
website/content/docs/hotchocolate/resolvers/index.md	Renames section title to “Resolvers”.
website/content/docs/hotchocolate/performance/index.md	Renames section title to “Performance”.
website/content/docs/hotchocolate/fetching-data/index.md	Renames section title to “Fetching Data”.
website/content/docs/hotchocolate/fetching-data/batching/index.md	Renames section title to “Batching”.
website/content/docs/hotchocolate/fetching-data/integrations/index.md	Renames section title to “Integrations”.
website/content/docs/hotchocolate/defining-a-schema/versioning.md	Clarifies opt-in applies to schema elements (incl. directive definitions) and updates introspection guidance.
website/content/docs/hotchocolate/defining-a-schema/directives.md	Adds documentation for directives applied to directive definitions, including introspection/troubleshooting.
website/content/docs/fusion/index.md	Updates doc title and adds metaTitle.
website/content/docs/fusion/entities-and-lookups.md	Documents constant arguments in @key field selections.
website/content/docs/fusion/directives-reference.md	Documents constant arguments in @key, @is, @require; clarifies @provides argument restriction.
website/content/docs/fusion/data-requirements-and-mapping.md	Adds a new section explaining constant arguments in @require/@is selection maps.
website/content/docs/fusion/composition.md	Updates composition error guidance and documents KEY_INVALID_ARGUMENTS and related semantics.

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