DOC: Fix notebook headings - remove extra H1s

Author: giovaniceotto

docs/notebooks/environment_analysis_class_usage.ipynb

@@ -143,14 +143,15 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
    "source": [
-    "# Surface level Analysis"
+    "## Surface level Analysis"
    ]
   },
   {
@@ -166,14 +167,15 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
    "source": [
-    "## Average and record values"
+    "### Average and record values"
    ]
   },
   {
@@ -12598,14 +12600,15 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
    "source": [
-    "## Wind Roses"
+    "### Wind Roses"
    ]
   },
   {
@@ -12703,14 +12706,15 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
    "source": [
-    "# Pressure Level Analysis"
+    "## Pressure Level Analysis"
    ]
   },
   {
@@ -12726,14 +12730,15 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
    "source": [
-    "## Average wind profiles"
+    "### Average wind profiles"
    ]
   },
   {
@@ -29669,10 +29674,11 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Going further with your analysis"
+    "## Going further with your analysis"
    ]
   },
   {
@@ -29798,7 +29804,7 @@
  "metadata": {
   "celltoolbar": "Slideshow",
   "kernelspec": {
-   "display_name": "Python 3.10.0 ('rocketpy_dev')",
+   "display_name": "rocketpy_dev",
    "language": "python",
    "name": "python3"
   },
@@ -29812,11 +29818,11 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.0"
+   "version": "3.10.0 | packaged by conda-forge | (default, Nov 10 2021, 13:20:59) [MSC v.1916 64 bit (AMD64)]"
   },
   "vscode": {
    "interpreter": {
-    "hash": "18e93d5347af13ace37d47ea4e2a2ad720f0331bd9cb28f9983f5585f4dfaa5c"
+    "hash": "59ee05f09b472313b636ec8ef2b98477e505db7da462e17a2a6c52426ac2f597"
    }
   }
  },