[0.5.0] Refactor (#938)

README.md

benchmarks/struct_indices/spider/evaluate.py

benchmarks/struct_indices/spider/generate_sql.py

docs/getting_started/installation.md

docs/getting_started/starter_example.md

docs/guides/notebooks.rst

docs/guides/primer.rst

docs/guides/primer/index_guide.md

docs/guides/primer/usage_pattern.md

docs/guides/tutorials.rst

docs/guides/tutorials/building_a_chatbot.md

docs/guides/tutorials/fullstack_app_guide.md

docs/guides/tutorials/sql_guide.md

docs/guides/use_cases.md

docs/how_to/analysis.rst

docs/how_to/analysis/cost_analysis.md

docs/how_to/analysis/optimizers.md

docs/how_to/analysis/playground.md

docs/how_to/customization.rst

docs/how_to/customization/custom_llms.md