docs: turn WebDAV sections into graveyard notices

docs/developer-guide/integrate-external-services.md

@@ -109,14 +109,13 @@ asset.download("local_file.nwb")
 
 ### 3. WebDAV Integration
 
-DANDI provides a [WebDAV](https://en.wikipedia.org/wiki/WebDAV) service at https://webdav.dandiarchive.org/ that allows external services to access DANDI data using standard WebDAV clients:
+!!! warning "Service discontinued"
 
-```python
-import requests
+    The DANDI [WebDAV](https://en.wikipedia.org/wiki/WebDAV) service (formerly at `https://webdav.dandiarchive.org/`) has been brought down and is no longer available.
 
-# Access a file via WebDAV
-response = requests.get("https://webdav.dandiarchive.org/dandisets/000123/draft/path/to/file.nwb")
-```
+    If your integration relied on WebDAV access to DANDI, please contact us at [info@dandiarchive.org](mailto:info@dandiarchive.org) so we can consider bringing the service back.
+
+    The service's source code remains available at <https://github.com/dandi/dandidav/> for independent DANDI deployments.
 
 ### 4. Custom Visualization Services
 

docs/user-guide-using/accessing-data/downloading.md

@@ -112,21 +112,15 @@ Learn more about DataLad from its handbook at <https://handbook.datalad.org/>.
 
 ## Using WebDAV
 
-DANDI provides a [WebDAV](https://en.wikipedia.org/wiki/WebDAV) service at https://webdav.dandiarchive.org/ for accessing the data in the DANDI archive.
-You can use any WebDAV client or even a web browser to access the data - any Dandiset, any version, any file or collection of files, and navigate inside Zarr assets (including their versions).
+!!! warning "Service discontinued"
 
-You can use any web download tool to download the data from the DANDI archive, e.g.
+    The DANDI [WebDAV](https://en.wikipedia.org/wiki/WebDAV) service (formerly at `https://webdav.dandiarchive.org/`) has been brought down and is no longer available.
 
-````commandline
-wget -r -np -nH --cut-dirs=3 https://webdav.dandiarchive.org/dandisets/000027/releases/0.210831.2033/
-````
-
-for a download of a specific release `0.210831.2033` of the `000027` dandiset.
+    If you have a use case that would benefit from a WebDAV interface to DANDI, please let us know at [info@dandiarchive.org](mailto:info@dandiarchive.org) so we can consider bringing the service back.
 
-**Note:** The WebDAV service does not directly serve any file contents; it instead relies on redirects to AWS S3 storage where the contents are stored.
-You might need to configure your WebDAV client to follow redirects; e.g., for the [davfs2](https://savannah.nongnu.org/projects/davfs2) WebDAV client, set `follow_redirect` to `1` in `/etc/davfs2/davfs2.conf`.
+    In the meantime, DANDI data remains accessible via [the DANDI CLI](#using-the-python-cli-client), [DataLad](#using-datalad), or [S3 directly](#using-s3-directly).
 
-**Developers' note:** The WebDAV service's code is available at https://github.com/dandi/dandidav/ and can also be used for independent DANDI deployments.
+    The service's source code remains available at <https://github.com/dandi/dandidav/> for anyone wishing to run their own deployment.
 
 
 ## Using S3 Directly

docs/user-guide-using/accessing-data/index.md

@@ -9,9 +9,8 @@ DANDI offers several methods for accessing data, each suited to different use ca
 1. **Web Interface**: Browse and download individual files directly from the DANDI web application.
 2. **DANDI CLI**: Command-line tool for downloading entire Dandisets or specific files.
 3. **DataLad**: Access Dandisets as Git repositories with DataLad for version control and reproducibility.
-4. **WebDAV**: Access DANDI data using standard WebDAV clients.
-5. **DANDI Hub**: Analyze data directly in the cloud using Jupyter notebooks.
-6. **Programmatic Access**: Access data programmatically using the DANDI API through Python or other languages.
+4. **DANDI Hub**: Analyze data directly in the cloud using Jupyter notebooks.
+5. **Programmatic Access**: Access data programmatically using the DANDI API through Python or other languages.
 
 ## Choosing the Right Access Method
 
@@ -20,7 +19,7 @@ The best method for accessing data depends on your specific needs:
 - **For browsing and exploring data**: Use the [Web Interface](./downloading.md#using-the-dandi-web-application).
 - **For downloading entire Dandisets**: Use the [DANDI CLI](./downloading.md#using-the-python-cli-client).
 - **For version control and reproducibility**: Use [DataLad](./downloading.md#using-datalad).
-- **For integration with existing tools**: Use [WebDAV](./downloading.md#using-webdav), [DANDI Python and Command-line Client](./downloading.md#using-the-python-cli-client), or [DANDI API](./external-services.md#custom-integrations) depending on the tool language/interfaces.
+- **For integration with existing tools**: Use the [DANDI Python and Command-line Client](./downloading.md#using-the-python-cli-client) or the [DANDI API](./external-services.md#custom-integrations) depending on the tool language/interfaces.
 - **For cloud-based analysis**: Use [DANDI Hub](../dandi-hub.md).
 - **For programmatic access**: Use the [DANDI Python Client](https://dandi.readthedocs.io/) for Python or the [DANDI API](./external-services.md#custom-integrations) for other languages.
 
@@ -37,7 +36,7 @@ When accessing data from DANDI, consider the following:
 
 Explore the following pages for detailed information on each access method:
 
-- [Downloading Data](./downloading.md): Learn how to download data using the web interface, DANDI CLI, DataLad, or WebDAV.
+- [Downloading Data](./downloading.md): Learn how to download data using the web interface, DANDI CLI, DataLad, or direct S3 access.
 - [Streaming Data](./streaming.md): Learn how to stream data without downloading entire files.
 - [External Services](./external-services.md): Learn about external services that can be used to access and analyze DANDI data.
 - [DANDI Hub](../dandi-hub.md): Learn how to use DANDI Hub for cloud-based analysis.