Merge pull request #41 from pyscript/fpliger/add_latest_deprecation_warning

Add note about deprecation warning using latest

Author: fpliger

docs/user-guide/first-steps.md

@@ -30,6 +30,13 @@ CSS:
 </html>
 ```
 
+!!! warning
+
+    Since release `2023.11.1` the `https://pyscript.net/latest/` path has been deprecated and will be
+    completely removed from release >= `2023.12.x`. If you've been using `/latest` as a path we
+    highly encourage you to pin your application to a specific version to avoid breaking your
+    application.
+
 There are two ways to tell PyScript how to find your code.
 
 * With a standard HTML `<script>` tag whose `type` attribute is either `py`