Unpublish C# 8 patterns

The ECMA committee merged dotnet/csharpstandard#873

Now, remove the feature spec from publication.

Author: BillWagner

docfx.json

@@ -48,7 +48,6 @@
             },
             {
                 "files": [
-                    "csharp-8.0/*.md",
                     "csharp-9.0/*.md",
                     "csharp-10.0/*.md",
                     "csharp-11.0/*.md",
@@ -62,24 +61,6 @@
                     "**/README.md",
                     "inactive/**",
                     "rejected/**",
-                    "csharp-8.0/alternative-interpolated-verbatim.md",
-                    "csharp-8.0/async-using.md",
-                    "csharp-8.0/constraints-in-overrides.md",
-                    "csharp-8.0/constructed-unmanaged.md",
-                    "csharp-8.0/notnull-constraint.md",
-                    "csharp-8.0/obsolete-accessor.md",
-                    "csharp-8.0/shadowing-in-nested-functions.md",
-                    "csharp-8.0/static-local-functions.md",
-                    "csharp-8.0/unconstrained-null-coalescing.md",
-                    "csharp-8.0/nullable-reference-types.md",
-                    "csharp-8.0/nullable-reference-types-specification.md",
-                    "csharp-8.0/nested-stackalloc.md",
-                    "csharp-8.0/readonly-instance-members.md",
-                    "csharp-8.0/null-coalescing-assignment.md",
-                    "csharp-8.0/async-streams.md",
-                    "csharp-8.0/ranges.md",
-                    "csharp-8.0/using.md",
-                    "csharp-8.0/default-interface-methods.md",
                     "csharp-9.0/nullable-reference-types-specification.md",
                     "csharp-9.0/nullable-constructor-analysis.md",
                     "csharp-9.0/nullable-parameter-default-value-analysis.md",
@@ -524,7 +505,6 @@
             },
             "ms.date": {
                 "_csharpstandard/standard/*.md": "09/12/2025",
-                "_csharplang/proposals/csharp-8.0/*.md": "09/10/2019",
                 "_csharplang/proposals/csharp-9.0/*.md": "07/29/2020",
                 "_csharplang/proposals/csharp-10.0/*.md": "08/07/2021",
                 "_csharplang/proposals/csharp-11.0/*.md": "09/30/2022",
@@ -638,7 +618,6 @@
                 "_csharpstandard/standard/standard-library.md": "Standard library",
                 "_csharpstandard/standard/documentation-comments.md": "Documentation comments",
                 "_csharpstandard/standard/Bibliography.md": "Bibliography",
-                "_csharplang/proposals/csharp-8.0/patterns.md": "Recursive pattern matching",
                 "_csharplang/proposals/csharp-9.0/covariant-returns.md": "Covariant return types",
                 "_csharplang/proposals/csharp-9.0/extending-partial-methods.md": "Extending partial methods",
                 "_csharplang/proposals/csharp-9.0/extension-getenumerator.md": "Extension GetEnumerator support in foreach",
@@ -765,7 +744,6 @@
                 "_csharpstandard/standard/standard-library.md": "This appendix lists requirements of the specification library. The C# language relies on these types for some of its behavior.",
                 "_csharpstandard/standard/documentation-comments.md": "This appendix describes XML comments that are used to document your program.",
                 "_csharpstandard/standard/Bibliography.md": "This appendix lists external standards referenced in this specification.",
-                "_csharplang/proposals/csharp-8.0/patterns.md": "This feature specification describes recursive pattern matching, where patterns can nest inside other patterns.",
                 "_csharplang/proposals/csharp-9.0/covariant-returns.md": "This feature specification describes covariant return types, where overriding member declarations can return a type derived from the overridden member declaration.",
                 "_csharplang/proposals/csharp-9.0/extending-partial-methods.md": "This feature specification describes extensions to partial methods. These extensions enable source generators to create or call partial methods.",
                 "_csharplang/proposals/csharp-9.0/extension-getenumerator.md": "This feature specification describes the necessary pattern for an extension method to provide the GetEnumerator support in a foreach loop.",
@@ -861,7 +839,6 @@
             "titleSuffix": {
                 "docs/**/*.md": ".NET",
                 "_csharpstandard/standard/*.md": "C# language specification",
-                "_csharplang/proposals/csharp-8.0/*.md": "C# feature specifications",
                 "_csharplang/proposals/csharp-9.0/*.md": "C# feature specifications",
                 "_csharplang/proposals/csharp-10.0/*.md": "C# feature specifications",
                 "_csharplang/proposals/csharp-11.0/*.md": "C# feature specifications",

docs/csharp/specification/toc.yml

@@ -125,8 +125,6 @@ items:
       href: ../../../_csharplang/proposals/csharp-14.0/first-class-span-types.md
   - name: Patterns
     items:
-    - name: Recursive pattern matching
-      href: ../../../_csharplang/proposals/csharp-8.0/patterns.md
     - name: Pattern matching enhancements
       href: ../../../_csharplang/proposals/csharp-9.0/patterns3.md
     - name: Extended property patterns