Fix wrong JSON document in lesson_base4

abitutorials/base1/lesson_base1.ipynb

@@ -2687,9 +2687,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python [conda env:env3.6]",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "conda-env-env3.6-py"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
@@ -2701,7 +2701,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.7.0"
   },
   "latex_envs": {
    "bibliofile": "biblio.bib",

abitutorials/base4/lesson_base4.ipynb

@@ -26,12 +26,11 @@
     "  <p class=\"lead\">\n",
     "    <a class=\"btn btn-primary btn-lg\" href=\"#\" role=\"button\">Learn more</a>\n",
     "  </p>\n",
-    "</div>",
-    "This tutorial is a complement to the standard [ABINIT tutorial on aluminum](https://docs.abinit.org/tutorial/base4). Here, powerful flow and visualisation procedures\n",
+    "</div>This tutorial is a complement to the standard [ABINIT tutorial on aluminum](https://docs.abinit.org/tutorial/base4). Here, powerful flow and visualisation procedures\n",
     "will be demonstrated. Still, some basic understanding of the stand-alone working of ABINIT is a prerequisite.\n",
     "Also, in order to fully benefit from this Abipy tutorial, other more basic Abipy tutorials should have been followed,\n",
     "as suggested in the [abitutorials index page](https://nbviewer.jupyter.org/github/abinit/abitutorials/blob/master/abitutorials/index.ipynb).\n",
-    "\n",
+    "\n"
    ]
   },
   {
@@ -9379,7 +9378,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python [default]",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -9393,7 +9392,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.7.0"
   },
   "latex_envs": {
    "bibliofile": "biblio.bib",