docs: fix broken markdown links after renaming to directory index

Author: lukekim

website/docs/components/data-accelerators/index.md

@@ -36,10 +36,10 @@ By default, datasets are locally materialized using in-memory Arrow records.
 | `sqlite`   | Embedded [SQLite][sqlite]       | Release Candidate | `memory`, `file` |
 | `turso`    | Embedded [Turso][turso]         | Beta              | `memory`, `file` |
 
-[cayenne]: ./cayenne.md
-[duckdb]: ./duckdb.md
+[cayenne]: ./cayenne/index.md
+[duckdb]: ./duckdb/index.md
 [postgres]: data-accelerators/postgres
-[sqlite]: ./sqlite.md
+[sqlite]: ./sqlite/index.md
 [turso]: ./turso.md
 
 ## Choosing an Accelerator

website/docs/components/models/index.md

@@ -22,10 +22,10 @@ Spice supports various model providers for traditional machine learning (ML) mod
 | [`databricks`][databricks] | Models deployed to Databricks Mosaic AI      | Alpha             | -            | OpenAI-compatible HTTP endpoint |
 | ~~`perplexity`~~           | ~~Perplexity~~ ([Deprecated][perplexity])    | Deprecated        | -            | -                               |
 
-[openai]: ./openai.md
+[openai]: ./openai/index.md
 [bedrock]: ./bedrock.md
-[file]: ./filesystem.md
-[hf]: ./huggingface.md
+[file]: ./filesystem/index.md
+[hf]: ./huggingface/index.md
 [spice]: ./spiceai.md
 [azure]: ./azure.md
 [ant]: ./anthropic.md