Remove .NET Framework-specific remarks

### Describe the issue or suggestion

Related to #10722.

- [x] Create new .NET Framework-specific API docs repo and set up publishing.
- [x] Remove .NET Framework, .NET Standard, and UWP monikers and source folders from dotnet-api-docs repo.
- [x] Remove namespace XML files for .NET Framework-only namespaces.
- [x] Upgrade all snippets to target .NET 8 or later.
- [x] Delete orphaned snippets.
- [x] Remove .NET Framework-specific remarks/exceptions/usage notes/etc. This is prep work for backporting docs to /// in dotnet/runtime. This work helps to avoid confusing agents that might be looking at the repo as a source of understanding and might not understand the nuances of multi-targeting.
- [x] If PNSE is always thrown on modern .NET, delete other exceptions
- [x] Delete seealso/altmember references to .NET Framework APIs
- [x] Delete seealso/altmember references to/from obsolete/deprecated APIs (e.g. CAS APIs)
- [x] Remove remarks/examples/usage notes for obsolete/deprecated APIs
- [x] Remove remarks about adding an assembly reference to access the API
- [x] Remove remarks about disposing of object because it implements IDisposable (?)
- [x] Delete other exceptions where PNSE or NSE is thrown in all cases.
- [x] Organize/clean up remarks in "includes" folder
- [x] Fix up indentation spaces after hyphened bullets
- [x] Delete refs to .NET Compact Framework
- [ ] Delete all remarks/examples in System.Configuration APIs? See https://learn.microsoft.com/en-us/dotnet/core/porting/modernize#appconfig. Note that TraceSource [can be initialized from app.config](https://github.com/dotnet/core/issues/7716#issuecomment-1232209892), however.
- [x] Remove references to:
- [x] "unmanaged code permission"
- [x] "full trust"
- [x] "partially trusted" and "partial trust"
- [x] "code-access-security"
- [x] "security-transparent-code"
- [x] "security demand" and "link demand"
- [x] "code access security"
- [x] "PermissionAttribute>"
- [x] "cas-deprecated"
- [x] "\"
- [x] "CER" and "ConstrainedExecution" and "constrained execution" and "SYSLIB0004"
- [x] "application domain" (?)
- [x] "web-request-obsolete"
- [x] .NET Core
- [x] .NET 5+
- [x] app.config/machine.config/web.config
- [x] Windows 95, Windows 98, Windows Millennium Edition, Windows 2000, Windows XP, Windows Server 2003
- [x] /dotnet/framework
- [ ] Windows Vista/XP and UAC (?)

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[Associated WorkItem - 569834](https://dev.azure.com/msft-skilling/Content/_workitems/edit/569834)