Annotate stub tutorial notebooks with pointers to the book

Eight placeholder notebooks (duals/sweeps, operating points, geometry
optimization, nonlinear lifting-line, AeroBuildup methodology/vectorized,
AirfoilInviscid) now open with a markdown note linking to the book
chapter that covers the topic in full. Markdown-only change; nbval
collection and execution unaffected.

Author: peterdsharpe

tutorial/01 - Optimization and Math/08 - Parametric Sensitivities (Dual Variables).ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/03-solvers-and-solutions.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "markdown",
    "source": [

tutorial/01 - Optimization and Math/09 - Sweeps and Carpet Plots.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/03-solvers-and-solutions.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {

tutorial/04 - Geometry and Data Structures/01 - AeroSandbox Data Structures/02 - Operating Points.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/07-atmosphere-propulsion-weights.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -31,4 +38,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 0
-}
+}

tutorial/04 - Geometry and Data Structures/01 - AeroSandbox Data Structures/03 - Design Optimization with AeroSandbox Data Structures.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/04-geometry.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,

tutorial/06 - Aerodynamics/01 - AeroSandbox 3D Aerodynamics Tools/02 - Nonlinear Lifting-Line/02 - Nonlinear Lifting-Line.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/06-aircraft-aerodynamics.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,

tutorial/06 - Aerodynamics/01 - AeroSandbox 3D Aerodynamics Tools/03 - AeroBuildup Aerodynamics Engine/02 - AeroBuildup Methodology.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/06-aircraft-aerodynamics.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,

tutorial/06 - Aerodynamics/01 - AeroSandbox 3D Aerodynamics Tools/03 - AeroBuildup Aerodynamics Engine/03 - Vectorized Aerodynamics.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/06-aircraft-aerodynamics.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,

tutorial/06 - Aerodynamics/02 - AeroSandbox 2D Aerodynamics Tools/03 - AirfoilInviscid.ipynb

@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> **\ud83d\udcd6 This topic is covered in depth in [The AeroSandbox Book](https://peterdsharpe.github.io/AeroSandbox/05-airfoil-aerodynamics.html)** \u2014 the canonical AeroSandbox documentation. This notebook is a placeholder."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,