add headlines to two tutorials

tutorials/grueneisen_workflow.ipynb

@@ -1,12 +1,16 @@
 {
  "cells": [
   {
+   "metadata": {},
    "cell_type": "markdown",
-   "id": "0",
+   "source": "# Grueneisen Workflow (VASP)",
+   "id": "11f88d7c79c6b901"
+  },
+  {
    "metadata": {},
-   "source": [
-    "This part is needed for the execution in the notebook.\n"
-   ]
+   "cell_type": "markdown",
+   "source": "This part is needed for the execution in the notebook.\n",
+   "id": "0"
   },
   {
    "cell_type": "code",

tutorials/lobster_workflow.ipynb

@@ -1,12 +1,16 @@
 {
  "cells": [
   {
-   "cell_type": "raw",
-   "id": "0",
    "metadata": {},
-   "source": [
-    "The first lines are needed to ensure that we can mock VASP and LOBSTER runs. The test files here might not belong to the same calculation but are good enough for testing."
-   ]
+   "cell_type": "markdown",
+   "source": "# LOBSTER Workflow Tutorial (Using VASP for DFT)",
+   "id": "7be337c7e641e197"
+  },
+  {
+   "metadata": {},
+   "cell_type": "markdown",
+   "source": "The first lines are needed to ensure that we can mock VASP and LOBSTER runs. The test files here might not belong to the same calculation but are good enough for testing.",
+   "id": "79249014870760ef"
   },
   {
    "cell_type": "code",
@@ -30,12 +34,10 @@
    ]
   },
   {
-   "cell_type": "markdown",
-   "id": "2",
    "metadata": {},
-   "source": [
-    "We first load a structure that we want to analyze with bonding analysis."
-   ]
+   "cell_type": "markdown",
+   "source": "We first load a structure that we want to analyze with bonding analysis.",
+   "id": "fb06cf07e2f77f48"
   },
   {
    "cell_type": "code",

tutorials/qha_workflow.ipynb

@@ -1,12 +1,10 @@
 {
  "cells": [
   {
-   "cell_type": "markdown",
-   "id": "0",
    "metadata": {},
-   "source": [
-    "# Quasi-harmonic Workflow Tutorial with VASP"
-   ]
+   "cell_type": "markdown",
+   "source": "# Quasi-harmonic Workflow Tutorial with VASP",
+   "id": "84ab7b2bff387f8a"
   },
   {
    "cell_type": "markdown",
@@ -74,9 +72,8 @@
    ]
   },
   {
-   "cell_type": "markdown",
-   "id": "3",
    "metadata": {},
+   "cell_type": "raw",
    "source": [
     "This tutorial will make use of a quasi-harmonic workflow\n",
     " that allows to include volume-dependent anharmonicity \n",
@@ -89,7 +86,8 @@
     " to arrive at free energy-volume curves\n",
     " that are the starting point for the q\n",
     " uasi-harmonic approximation."
-   ]
+   ],
+   "id": "5d833f038f4f4a22"
   },
   {
    "cell_type": "markdown",