feat: migrate legacy docs (#1568)

...t/docs/llamaindex/modules/llms/available_llms/bedrock.mdx

...docs/llamaindex/modules/llms/available_llms/deepinfra.mdx

.../docs/llamaindex/modules/llms/available_llms/deepseek.mdx

...docs/llamaindex/modules/llms/available_llms/fireworks.mdx

...nt/docs/llamaindex/modules/llms/available_llms/gemini.mdx

...tent/docs/llamaindex/modules/llms/available_llms/groq.mdx

...nt/docs/llamaindex/modules/llms/available_llms/llama2.mdx

...t/docs/llamaindex/modules/llms/available_llms/mistral.mdx

...nt/docs/llamaindex/modules/llms/available_llms/ollama.mdx

...nt/docs/llamaindex/modules/llms/available_llms/openai.mdx

...t/docs/llamaindex/modules/llms/available_llms/portkey.mdx

.../docs/llamaindex/modules/llms/available_llms/together.mdx

apps/next/src/content/docs/llamaindex/modules/llms/index.mdx

.../next/src/content/docs/llamaindex/modules/node_parser.mdx

...lamaindex/modules/node_postprocessors/cohere_reranker.mdx

...ent/docs/llamaindex/modules/node_postprocessors/index.mdx

...lamaindex/modules/node_postprocessors/jinaai_reranker.mdx

...ex/modules/node_postprocessors/mixedbreadiai_reranker.mdx

...next/src/content/docs/llamaindex/modules/prompt/index.mdx

...c/content/docs/llamaindex/modules/query_engines/index.mdx