Reorganize documentation on the webpage

docs/source/advanced_apis/index.md

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+# Advanced APIs
+
+## Post-training
+Fine-tunes a model.
+
+```{toctree}
+:maxdepth: 1
+
+post_training/index
+```
+
+## Eval
+Generates outputs (via Inference or Agents) and perform scoring.
+
+```{toctree}
+:maxdepth: 1
+
+eval/index
+```
+
+```{include} evaluation_concepts.md
+:start-after: ## Evaluation Concepts
+```
+
+## Scoring
+Evaluates the outputs of the system.
+
+```{toctree}
+:maxdepth: 1
+
+scoring/index
+```
+