Maintenance (#717)

* remove pydantic dependency

* poetry update

* remove deprecated code

* use `config.files` instead of hardcoding file path

* remove `write_graph`

* fix tests

examples/docs/01_Intro.ipynb

@@ -120,7 +120,7 @@
     "\n",
     "In DVC, a pipeline is organized into multiple stages, which can be created by inheriting from ``zntrack.Node`` and implementing a ``run()`` method.\n",
     "\n",
-    "The ``run()`` method defines the logic of your pipeline stage, which will later be executed by our pipeline manager (e.g. ``dvc repro``). To integrate your new Node with DVC, you write the input script with the ``write_graph()`` command.\n",
+    "The ``run()`` method defines the logic of your pipeline stage, which will later be executed by our pipeline manager (e.g. ``dvc repro``).\n",
     "\n",
     "As an example, let's create a ``RandomNumber`` Node that generates a random integer between 0 and a parameterized maximum value. To do this, we'll use the zntrack module to define our Node's inputs and outputs:"
    ]
@@ -182,10 +182,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "To add the Node to the DVC pipeline we can use `write_graph()` to create the DVC stage and let DVC run the commands for us.\n",
-    "DVC will call `node = RandomNumber.load()` followed by `node.run_and_save()`.\n",
-    "By default, ZnTrack will only build the graph without running it. We can change that by using `write_graph(run=True)`.\n",
-    "You can also pass other commands like `always_changed=True, external=True` to the `write_graph()` command."
+    "To add the Node to the DVC pipeline we can employ a context manager and use `project.run()`."
    ]
   },
   {

examples/docs/04_metrics_and_plots.ipynb

@@ -624,7 +624,10 @@
     "        )\n",
     "\n",
     "\n",
-    "ZnTrackMetric().write_graph(run=True)"
+    "with zntrack.Project() as project:\n",
+    "    node = ZnTrackMetric()\n",
+    "\n",
+    "project.run()"
    ]
   },
   {

examples/docs/05_metadata.ipynb

@@ -178,7 +178,10 @@
     }
    ],
    "source": [
-    "SleepNode().write_graph(run=True)"
+    "with zntrack.Project() as project:\n",
+    "    node = SleepNode()\n",
+    "\n",
+    "project.run()"
    ]
   },
   {
@@ -310,7 +313,10 @@
     }
    ],
    "source": [
-    "SleepNodeMulti().write_graph(run=True)"
+    "with zntrack.Project() as project:\n",
+    "    node = SleepNodeMulti()\n",
+    "\n",
+    "project.run()"
    ]
   },
   {