docs: update docs on how local indexing works

Author: jamestthompson3

webui/website/src/content/docs/configuration.md

@@ -111,7 +111,7 @@ When multiple filters are specified, they are applied in order: excludes first,
 
 ## Local Directory Indexing
 
-The `indexer.directories` option lets you index local files so they appear alongside your browser history in search results. Files are indexed automatically when the server starts, running in the background so the server is available immediately.
+The `indexer.directories` option lets you index local files so they appear alongside your browser history in search results. Files are indexed automatically when the server starts, running in the background so the server is available immediately. A file watcher monitors configured directories for changes, so new and modified files are indexed automatically without needing to restart the server.
 
 ```yaml
 indexer:
@@ -132,9 +132,9 @@ Files are indexed recursively, with the following rules:
 - Files larger than 1 MB are skipped
 - Files matching `sensitive_content_patterns` are skipped
 
-On subsequent server starts, only files that have been modified since they were last indexed are re-processed. File results appear with the domain `local` and are served through the Hister web interface directly.
+Changes to indexed directories are picked up automatically by the file watcher — no server restart is needed. On server start, only files that have been modified since they were last indexed are re-processed. File results appear with the domain `local` and are served through the Hister web interface directly.
 
-No reindex is required when adding or removing directories — simply update the config and restart the server.
+No reindex is required when adding or removing files — they are detected and indexed automatically.
 
 ## Access Token