chore: import upstream snapshot with attribution

docs/workflow/task/url.md

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+# Url Task
+
+![task](../../images/task.png#only-light)
+![task](../../images/task-dark.png#only-dark)
+
+The Url Task validates that inputs start with a url prefix.
+
+## Example
+
+The following shows a simple example using this task as part of a workflow.
+
+```python
+from txtai.workflow import UrlTask, Workflow
+
+workflow = Workflow([UrlTask()])
+workflow(["https://file.to.download", "file:////local/file/to/copy"])
+```
+
+## Configuration-driven example
+
+This task can also be created with workflow configuration.
+
+```yaml
+workflow:
+  tasks:
+    - task: url
+```
+
+## Methods
+
+Python documentation for the task.
+
+### ::: txtai.workflow.UrlTask.__init__