chore: import upstream snapshot with attribution

docs/source/apis.rst

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+:orphan:
+
+=========
+NeMo APIs
+=========
+
+You can learn more about the underlying principles of the NeMo codebase in this section.
+
+The `NeMo Toolkit codebase <https://github.com/NVIDIA/NeMo>`__ is composed of a `core <https://github.com/NVIDIA/NeMo/tree/main/nemo/core>`__ section which contains the main building blocks of the framework, and various `collections <https://github.com/NVIDIA/NeMo/tree/main/nemo/collections>`__ which help you
+build specialized AI models.
+
+You can learn more about aspects of the NeMo "core" by following the links below:
+
+.. toctree::
+   :maxdepth: 1
+   :name: core
+   :titlesonly:
+
+   core/core
+   core/neural_modules
+   core/exp_manager
+   core/neural_types
+   core/adapters/intro
+
+You can learn more about aspects of the NeMo APIs by following the links below:
+
+.. toctree::
+   :maxdepth: 1
+   :name: API
+   :titlesonly:
+
+   core/api
+   common/intro
+   asr/api
+   tts/api
+   audio/api
+
+
+Alternatively, you can jump straight to the documentation for the individual collections:
+
+* :doc:`Automatic Speech Recognition (ASR) <../asr/intro>`
+
+* :doc:`Text-to-Speech (TTS) <../tts/intro>`
+
+* :doc:`Audio Processing <../audio/intro>`
+
+* :doc:`SpeechLM2 <../speechlm2/intro>`
+