make documentation

Author: hexajonal

docs/index.rst

@@ -17,9 +17,9 @@ Developed by Jamila Taaki (MIDAS).
 Installation
 --------
 
-.. code-block:: bash
+```
     pip install pystarshade
-
+```
 
 Usage
 --------
@@ -28,12 +28,13 @@ The simplest way to use PyStarshade is by calling the function 'source_field_to_
 takes as input a 2D source-field of size (N_s, N_s) and spatial sampling ds and returns the 2D output
 field incident on a CCD of size (N_pix, N_pix) and pixel size dp. 
 
-.. code-block:: python
+```
     from pystarshade.simulate_field import source_field_to_ccd
 
     source_field_to_ccd(source_field, wl, dist_xo_ss, dist_ss_t, focal_length_lens, radius_lens, 
                         N_s = 333, N_x = 6401, N_t = 1001, N_pix = 4001, 
                         ds = 0.3*au_to_meter, dx = 0.01, dt = 0.0116, dp=.5*1.9e-7)```
+```
 
 Input data
 --------