GRMHDTutorial: Added link to nb from main tutorial

NRPyPlus_Tutorial.ipynb

@@ -134,6 +134,7 @@
     "+ [The equations of general relativistic hydrodynamics (**GRHD**), in Cartesian coordinates](Tutorial-GRHD_Equations-Cartesian.ipynb)\n",
     "+ [The equations of general relativistic, force-free electrodynamics (**GRFFE**), in Cartesian coordinates](Tutorial-GRFFE_Equations-Cartesian.ipynb)\n",
     "+ [The equations of general relativistic magnetohydrodynamics (**GRMHD**), in Cartesian coordinates](Tutorial-GRMHD_Equations-Cartesian.ipynb)\n",
+    "    + [Derivation of the GRMHD evolution equations from $T^{\\mu\\nu}$ in our formalism](Tutorial-Derivation_of_GRMHD_Evolution_Equations.ipynb)\n",
     "+ [**`IllinoisGRMHD`** ](IllinoisGRMHD/doc/) with piecewise-polytrope/hybrid equation of state support (*Courtesy Leo Werneck*): <font color='red'>***In progress***</font>\n",
     "    + Diagnostic notebook: [<font color='green'>**sbPoynETNRPy**</font>: Evaluating $b^\\mu$ and $S^i$ in the <font color='green'>**Einstein Toolkit**</font>, using HydroBase variables as input](Tutorial-ETK_thorn-u0_smallb_Poynting.ipynb)\n",
     "         + Tutorial notebook: [Computing the 4-Velocity Time-Component $u^0$, the Magnetic Field Measured by a Comoving Observer $b^{\\mu}$, and the Poynting Vector $S^i$](Tutorial-u0_smallb_Poynting-Cartesian.ipynb)"

Tutorial-Derivation_of_GRMHD_Evolution_Equations.ipynb

@@ -60,6 +60,8 @@
     "    1. [Step 2.3](#energy_eqn): Evolution Equation for Energy Density Variable $\\tilde{\\tau}$\n",
     "    1. [Step 2.4](#induction_eqn): Evolution Equation for the Magnetic Field\n",
     "    1. [Step 2.5](#summary): Summary of the Conservative Variable Evolution Equations\n",
+    "1. [Appendix A](#levi-civita): **Levi-Civita Contractions**\n",
+    "1. [Appendix B](#curv_tensor): **Extrinsic Curvature Identities**\n",
     "1. [Step 3](#latex_pdf_output): **Output this notebook to $\\LaTeX$-formatted PDF file**"
    ]
   },