docs: add information about index storage in cache folder (#179)

* docs: add information about index storage in cache folder

* unlink things

Author: stephantul

README.md

@@ -24,7 +24,7 @@
 
 </div>
 
-Semble is a code search library built for agents. It returns the exact code snippets they need instantly, using ~98% fewer tokens than grep+read. Indexing and searching a full codebase end-to-end takes under a second, with ~200x faster indexing and ~10x faster queries than a code-specialized transformer, at 99% of its retrieval quality (see [benchmarks](#benchmarks)). Everything runs on CPU with no API keys, GPU, or external services. Run it as an [MCP server](#mcp-server) or call it from the shell via [AGENTS.md](#agentsmd) and any agent (Claude Code, Cursor, Codex, OpenCode, etc.) gets instant access to any repo.
+Semble is a code search library built for agents. It returns the exact code snippets they need instantly, using ~98% fewer tokens than grep+read. Indexing and searching a full codebase end-to-end takes under a second, with ~200x faster indexing and ~10x faster queries than a code-specialized transformer, at 99% of its retrieval quality (see [benchmarks](#benchmarks)). Everything runs on CPU with no API keys, GPU, or external services. Run it as an MCP server or call it from the shell via AGENTS.md and any agent (Claude Code, Cursor, Codex, OpenCode, etc.) gets instant access to any repo.
 
 ## Quickstart
 
@@ -136,7 +136,12 @@ semble savings --verbose # also show breakdown by call type
 
 Savings are calculated as follows: for each call, semble records the total character count of the unique files containing returned chunks and the character count of the snippets returned. Estimated tokens saved is `(file chars − snippet chars) / 4` (4 chars per token). This is a conservative estimate: the baseline is reading matched files in full, which is how coding agents often explore unfamiliar code.
 
-By default, stats are stored in the OS cache folder (`~/Library/Caches/semble/` on macOS, `~/.cache/semble/` on Linux, `%LOCALAPPDATA%\semble\Cache\` on Windows). To override this location you can supply an environment variable `SEMBLE_CACHE_LOCATION` which should be the full path to the target cache location e.g. 'd:\caches\storemysemblecachehere'.
+</details>
+
+<details>
+<summary>Storage</summary>
+
+By default, your Semble savings statistics and any saved indexes are stored in the OS cache folder (`~/Library/Caches/semble/` on macOS, `~/.cache/semble/` on Linux, `%LOCALAPPDATA%\semble\Cache\` on Windows). To override this location you can supply an environment variable `SEMBLE_CACHE_LOCATION` which should be the full path to the target cache location e.g. `~/my-folder/my-caches/semble`.
 
 </details>