Add missing frontmatter descriptions

[externl]

Adds a description: to the 22 content pages that had none — without one, the page renders an empty <meta name="description"> and empty OG/Twitter description, which hurts how these pages appear in search results and link previews.

The affected pages were the four tutorials, the template/existing-project installation pages, all six supported-platforms pages, the entire Slice language-reference section, the Slice encoding and Slic transport overviews, and a few icerpc-for-ice-users pages. Where a nav card already described the page (tutorials, installation, Slice encoding), the description reuses that card's copy verbatim; the rest are new one-liners written in the same style — worth a quick read since they're new user-facing copy.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR improves SEO and link-preview quality across the IceRPC docs by adding missing description: frontmatter to content pages that previously rendered empty <meta name="description"> / OG / Twitter descriptions.

Changes:

• Add description: frontmatter to Slice language-reference pages and key overviews.
• Add description: frontmatter to getting-started tutorials, installation pages, and supported-platforms pages.
• Add description: frontmatter to IceRPC-for-Ice-users overview and selected subpages.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
content/slice/language-reference/slice-grammar.md	Adds a frontmatter description for the Slice grammar reference page.
content/slice/language-reference/preprocessor-directives.md	Adds a frontmatter description for the Slice preprocessor directives reference page.
content/slice/language-reference/index.md	Adds a frontmatter description for the Slice language reference landing page.
content/slice/language-reference/doc-comments.md	Adds a frontmatter description for the Slice documentation comments reference page.
content/slice/encoding/overview.md	Adds a frontmatter description for the Slice encoding overview.
content/icerpc/slic-transport/overview.md	Adds a frontmatter description for the Slic transport overview.
content/icerpc-for-ice-users/index.md	Adds a frontmatter description for the “IceRPC for Ice users” landing page.
content/icerpc-for-ice-users/ice-definitions/language-mapping.md	Adds a frontmatter description for the Ice-to-C# mapping overview page.
content/icerpc-for-ice-users/ice-definitions/constants.md	Adds a frontmatter description for the constants/literals mapping page.
content/icerpc-for-ice-users/high-level-comparison/ice-reinvented.md	Adds a frontmatter description for the high-level comparison page.
content/getting-started/supported-platforms/icerpc-csharp-0_6.md	Adds a frontmatter description for supported platforms (C# 0.6).
content/getting-started/supported-platforms/icerpc-csharp-0_5.md	Adds a frontmatter description for supported platforms (C# 0.5).
content/getting-started/supported-platforms/icerpc-csharp-0_4.md	Adds a frontmatter description for supported platforms (C# 0.4).
content/getting-started/supported-platforms/icerpc-csharp-0_3.md	Adds a frontmatter description for supported platforms (C# 0.3).
content/getting-started/supported-platforms/icerpc-csharp-0_2.md	Adds a frontmatter description for supported platforms (C# 0.2).
content/getting-started/supported-platforms/icerpc-csharp-0_1.md	Adds a frontmatter description for supported platforms (C# 0.1).
content/getting-started/installation/template.md	Adds a frontmatter description for the .NET template installation/usage page.
content/getting-started/installation/existing-project.md	Adds a frontmatter description for the “existing project” installation page.
content/getting-started/icerpc-slice-tutorial/server-tutorial.md	Adds a frontmatter description for the IceRPC + Slice server tutorial.
content/getting-started/icerpc-slice-tutorial/client-tutorial.md	Adds a frontmatter description for the IceRPC + Slice client tutorial.
content/getting-started/icerpc-protobuf-tutorial/server-tutorial.md	Adds a frontmatter description for the IceRPC + Protobuf server tutorial.
content/getting-started/icerpc-protobuf-tutorial/client-tutorial.md	Adds a frontmatter description for the IceRPC + Protobuf client tutorial.

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