Add missing cell to notebooks for Colab

Author: AndrewSazonov

.github/copilot-instructions.md

@@ -104,8 +104,8 @@
 
 - Jupyter notebooks (`docs/docs/tutorials/*.ipynb`) are **generated
   artifacts** — never edit them by hand. Edit only the corresponding
-  `*.py` script, then run `pixi run notebook-convert` followed by
-  `pixi run notebook-prepare` to regenerate the notebook.
+  `*.py` script, then run `pixi run notebook-prepare` to regenerate the
+  notebook.
 
 ## Changes
 

docs/architecture/architecture.md

@@ -771,9 +771,8 @@ All examples below are drawn from the actual tutorials (`tutorials/`).
 
 > **Notebook workflow:** Jupyter notebooks (`*.ipynb`) in
 > `docs/docs/tutorials/` are generated artifacts. Edit only the
-> corresponding `*.py` script, then run `pixi run notebook-convert`
-> followed by `pixi run notebook-prepare` to regenerate the notebook.
-> Never edit `*.ipynb` files by hand.
+> corresponding `*.py` script, then run `pixi run notebook-prepare` to
+> regenerate the notebook. Never edit `*.ipynb` files by hand.
 
 ### 8.1 Project Setup
 

docs/docs/tutorials/ed-1.ipynb

@@ -1,5 +1,24 @@
 {
  "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "8dbf8e63",
+   "metadata": {
+    "tags": [
+     "hide-in-docs"
+    ]
+   },
+   "outputs": [],
+   "source": [
+    "# Check whether easydiffraction is installed; install it if needed.\n",
+    "# Required for remote environments such as Google Colab.\n",
+    "import importlib.util\n",
+    "\n",
+    "if importlib.util.find_spec('easydiffraction') is None:\n",
+    "    %pip install easydiffraction"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "0",

docs/docs/tutorials/ed-10.ipynb

@@ -1,5 +1,24 @@
 {
  "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "f42176f2",
+   "metadata": {
+    "tags": [
+     "hide-in-docs"
+    ]
+   },
+   "outputs": [],
+   "source": [
+    "# Check whether easydiffraction is installed; install it if needed.\n",
+    "# Required for remote environments such as Google Colab.\n",
+    "import importlib.util\n",
+    "\n",
+    "if importlib.util.find_spec('easydiffraction') is None:\n",
+    "    %pip install easydiffraction"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "0",

docs/docs/tutorials/ed-11.ipynb

@@ -1,5 +1,24 @@
 {
  "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "b38dbf4f",
+   "metadata": {
+    "tags": [
+     "hide-in-docs"
+    ]
+   },
+   "outputs": [],
+   "source": [
+    "# Check whether easydiffraction is installed; install it if needed.\n",
+    "# Required for remote environments such as Google Colab.\n",
+    "import importlib.util\n",
+    "\n",
+    "if importlib.util.find_spec('easydiffraction') is None:\n",
+    "    %pip install easydiffraction"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "0",

docs/docs/tutorials/ed-12.ipynb

@@ -1,5 +1,24 @@
 {
  "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "effff825",
+   "metadata": {
+    "tags": [
+     "hide-in-docs"
+    ]
+   },
+   "outputs": [],
+   "source": [
+    "# Check whether easydiffraction is installed; install it if needed.\n",
+    "# Required for remote environments such as Google Colab.\n",
+    "import importlib.util\n",
+    "\n",
+    "if importlib.util.find_spec('easydiffraction') is None:\n",
+    "    %pip install easydiffraction"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "0",