[InsertCreativityHere]

Now that the Slice compiler definitions live in slicec (icerpc/slicec#737), we should delete them from icerpc-slice.

[Copilot]

Pull request overview

Removes the Slice compiler definition files from this repository now that they live in slicec, and updates the top-level README to reflect the remaining directory layout for consumers cloning these Slice definitions.

Changes:

• Removed the Compiler/* Slice definition files (compiler symbol model and code generator interfaces).
• Updated README.md to drop the Compiler and top-level Ice rows and point Ice interop definitions to IceRpc/Ice.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
README.md	Updates the directory table to match the new layout (no Compiler/, Ice interop under IceRpc/Ice).
Compiler/SyntaxElements.slice	Removes compiler symbol/type model definitions from this repo.
Compiler/DocComment.slice	Removes doc comment model definitions from this repo.
Compiler/CodeGenerator.slice	Removes code generator interface and related types from this repo.

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