chore: cleanup orphaned content files (#9959)

Co-authored-by: jcanalesluna <56018501+jcanalesluna@users.noreply.github.com>

src/data/roadmaps/cpp/content/language-tools@Kb2Pbz0Sq7YlO1vCwYxnX.md

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-# Language Tools
-
-Language tools in C++ provide functionalities that aid developers in writing, analyzing, and maintaining C++ code. These tools often include compilers, debuggers, static analyzers, and build systems that help to automate tasks, identify potential errors, and improve the overall quality of the codebase. They streamline the development process, from initial coding to final deployment.

src/data/roadmaps/cpp/content/newest@sxbbKtg7kMNbkx7fXhjR9.md

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-# C++23
-
-C++23 is the latest version of the C++ standard, building upon previous iterations to introduce new features, library enhancements, and language improvements. It aims to simplify development, improve performance, and provide more modern tools for C++ programmers. This standard incorporates features like `std::expected`, stackable coroutines, and improvements to the standard library, making C++ more robust and expressive.
-
-Visit the following resources to learn more:
-
-- [@official@The Standard](https://isocpp.org/std/the-standard)
-- [@article@C++23](https://en.wikipedia.org/wiki/C%2B%2B23)
-- [@article@Overview of New Features in C++23](https://medium.com/@threehappyer/overview-of-new-features-in-c-23-68c5bc668958)
-- [@video@C++23: An Overview of Almost All New and Updated Features - Marc Gregoire - CppCon 2023](https://www.youtube.com/watch?v=Cttb8vMuq-Y)