chore(docs): update .gitignore and enhance arxiv-retriever documentation

Author: Gangadhar C

docs/core_docs/.gitignore

@@ -226,12 +226,6 @@ docs/versions/migrating_memory/chat_history.md
 docs/versions/migrating_memory/chat_history.mdx
 docs/troubleshooting/errors/INVALID_TOOL_RESULTS.md
 docs/troubleshooting/errors/INVALID_TOOL_RESULTS.mdx
-docs/integrations/toolkits/vectorstore.md
-docs/integrations/toolkits/vectorstore.mdx
-docs/integrations/toolkits/sql.md
-docs/integrations/toolkits/sql.mdx
-docs/integrations/toolkits/openapi.md
-docs/integrations/toolkits/openapi.mdx
 docs/integrations/vectorstores/weaviate.md
 docs/integrations/vectorstores/weaviate.mdx
 docs/integrations/vectorstores/upstash.md
@@ -260,10 +254,22 @@ docs/integrations/vectorstores/elasticsearch.md
 docs/integrations/vectorstores/elasticsearch.mdx
 docs/integrations/vectorstores/chroma.md
 docs/integrations/vectorstores/chroma.mdx
-docs/integrations/stores/in_memory.md
-docs/integrations/stores/in_memory.mdx
-docs/integrations/stores/file_system.md
-docs/integrations/stores/file_system.mdx
+docs/integrations/tools/tavily_search.md
+docs/integrations/tools/tavily_search.mdx
+docs/integrations/tools/serpapi.md
+docs/integrations/tools/serpapi.mdx
+docs/integrations/tools/google_scholar.md
+docs/integrations/tools/google_scholar.mdx
+docs/integrations/tools/exa_search.md
+docs/integrations/tools/exa_search.mdx
+docs/integrations/tools/duckduckgo_search.md
+docs/integrations/tools/duckduckgo_search.mdx
+docs/integrations/toolkits/vectorstore.md
+docs/integrations/toolkits/vectorstore.mdx
+docs/integrations/toolkits/sql.md
+docs/integrations/toolkits/sql.mdx
+docs/integrations/toolkits/openapi.md
+docs/integrations/toolkits/openapi.mdx
 docs/integrations/text_embedding/togetherai.md
 docs/integrations/text_embedding/togetherai.mdx
 docs/integrations/text_embedding/pinecone.md
@@ -292,6 +298,10 @@ docs/integrations/text_embedding/bedrock.md
 docs/integrations/text_embedding/bedrock.mdx
 docs/integrations/text_embedding/azure_openai.md
 docs/integrations/text_embedding/azure_openai.mdx
+docs/integrations/stores/in_memory.md
+docs/integrations/stores/in_memory.mdx
+docs/integrations/stores/file_system.md
+docs/integrations/stores/file_system.mdx
 docs/integrations/retrievers/tavily.md
 docs/integrations/retrievers/tavily.mdx
 docs/integrations/retrievers/kendra-retriever.md
@@ -332,6 +342,8 @@ docs/integrations/chat/xai.md
 docs/integrations/chat/xai.mdx
 docs/integrations/chat/togetherai.md
 docs/integrations/chat/togetherai.mdx
+docs/integrations/chat/perplexity.md
+docs/integrations/chat/perplexity.mdx
 docs/integrations/chat/openai.md
 docs/integrations/chat/openai.mdx
 docs/integrations/chat/ollama.md
@@ -350,6 +362,8 @@ docs/integrations/chat/google_generativeai.md
 docs/integrations/chat/google_generativeai.mdx
 docs/integrations/chat/fireworks.md
 docs/integrations/chat/fireworks.mdx
+docs/integrations/chat/deepseek.md
+docs/integrations/chat/deepseek.mdx
 docs/integrations/chat/cohere.md
 docs/integrations/chat/cohere.mdx
 docs/integrations/chat/cloudflare_workersai.md
@@ -366,16 +380,6 @@ docs/integrations/chat/arcjet.md
 docs/integrations/chat/arcjet.mdx
 docs/integrations/chat/anthropic.md
 docs/integrations/chat/anthropic.mdx
-docs/integrations/tools/tavily_search.md
-docs/integrations/tools/tavily_search.mdx
-docs/integrations/tools/serpapi.md
-docs/integrations/tools/serpapi.mdx
-docs/integrations/tools/google_scholar.md
-docs/integrations/tools/google_scholar.mdx
-docs/integrations/tools/exa_search.md
-docs/integrations/tools/exa_search.mdx
-docs/integrations/tools/duckduckgo_search.md
-docs/integrations/tools/duckduckgo_search.mdx
 docs/integrations/retrievers/self_query/weaviate.md
 docs/integrations/retrievers/self_query/weaviate.mdx
 docs/integrations/retrievers/self_query/vectara.md
@@ -392,16 +396,6 @@ docs/integrations/retrievers/self_query/hnswlib.md
 docs/integrations/retrievers/self_query/hnswlib.mdx
 docs/integrations/retrievers/self_query/chroma.md
 docs/integrations/retrievers/self_query/chroma.mdx
-docs/integrations/document_loaders/file_loaders/unstructured.md
-docs/integrations/document_loaders/file_loaders/unstructured.mdx
-docs/integrations/document_loaders/file_loaders/text.md
-docs/integrations/document_loaders/file_loaders/text.mdx
-docs/integrations/document_loaders/file_loaders/pdf.md
-docs/integrations/document_loaders/file_loaders/pdf.mdx
-docs/integrations/document_loaders/file_loaders/directory.md
-docs/integrations/document_loaders/file_loaders/directory.mdx
-docs/integrations/document_loaders/file_loaders/csv.md
-docs/integrations/document_loaders/file_loaders/csv.mdx
 docs/integrations/document_loaders/web_loaders/web_puppeteer.md
 docs/integrations/document_loaders/web_loaders/web_puppeteer.mdx
 docs/integrations/document_loaders/web_loaders/web_cheerio.md
@@ -413,4 +407,14 @@ docs/integrations/document_loaders/web_loaders/pdf.mdx
 docs/integrations/document_loaders/web_loaders/langsmith.md
 docs/integrations/document_loaders/web_loaders/langsmith.mdx
 docs/integrations/document_loaders/web_loaders/firecrawl.md
-docs/integrations/document_loaders/web_loaders/firecrawl.mdx
+docs/integrations/document_loaders/web_loaders/firecrawl.mdx
+docs/integrations/document_loaders/file_loaders/unstructured.md
+docs/integrations/document_loaders/file_loaders/unstructured.mdx
+docs/integrations/document_loaders/file_loaders/text.md
+docs/integrations/document_loaders/file_loaders/text.mdx
+docs/integrations/document_loaders/file_loaders/pdf.md
+docs/integrations/document_loaders/file_loaders/pdf.mdx
+docs/integrations/document_loaders/file_loaders/directory.md
+docs/integrations/document_loaders/file_loaders/directory.mdx
+docs/integrations/document_loaders/file_loaders/csv.md
+docs/integrations/document_loaders/file_loaders/csv.mdx

docs/core_docs/docs/integrations/retrievers/arxiv-retriever.mdx

@@ -97,3 +97,9 @@ await ragChain.invoke("What are the latest advances in quantum computing?");
 ## API reference
 
 For detailed documentation of all ArxivRetriever features and configurations, head to the [API reference](https://api.js.langchain.com/classes/_langchain_community.retrievers_arxiv.ArxivRetriever.html)
+
+
+## Related
+
+- Retriever [conceptual guide](/docs/concepts/#retrievers)
+- Retriever [how-to guides](/docs/how_to/#retrievers)