Split conductivity_and_seebeck, cleaning up, doc

doc/Transport.rst

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+.. index:: Transport
+
+.. _Transport:
+
+Transport calculations
+======================
+
+.. index:: Theory
+
+Formalism
+---------
+The optical conductivity and the Seebeck coefficient in the direction :math:`\alpha\beta` are defined as
+
+.. math::
+
+   \sigma_{\alpha\beta} = \beta e^{2} A_{0,\alpha\beta}  \ \ \  \text{and} \ \ \  S_{\alpha\beta} = -\frac{k_B}{|e|}\frac{A_{1,\alpha\beta}}{A_{0,\alpha\beta}} 
+
+in which the kinetic coefficients :math:`A_{n,\alpha\beta}` are given by
+
+.. math::
+  
+   A_{n,\alpha\beta} = N_{sp} \pi \hbar \int{d\omega \left(\beta\omega\right)^n f\left(\omega\right)f\left(-\omega\right)\Gamma_{\alpha\beta}\left(\omega\right)}
+
+with the transport distribution
+
+.. math::
+  
+   \Gamma_{\alpha\beta}\left(\omega\right) = \frac{1}{V} \sum_k Tr\left(v_{k,\alpha}A_{k}\left(\omega\right)v_{k,\beta}A_{k}\left(\omega\right)\right)
+
+.. index:: Prerequisite
+
+Prerequisites
+-------------
+
+.. note::
+   Coming soon!
+
+
+.. index:: Using the transport code.
+
+Using the transport code
+------------------------
+
+.. note::
+   Coming soon!
+
+
+.. index:: References
+
+References
+----------
+