[README] change figure directives and local paths links to figure and URL

Author: gph82

README.rst

@@ -3,16 +3,16 @@ mdciao: Accessible Analysis and Visualization of Molecular Dynamics Simulation D
 
 |Pip Package| |Python Package| |MacOs Package| |Coverage| |DOI| |License|
 
-.. figure:: doc/imgs/banner.png
+.. image:: https://github.com/gph82/mdciao/blob/master/doc/imgs/banner.png
    :scale: 33%
 
-.. figure:: doc/imgs/distro_and_violin.png
+.. image:: https://github.com/gph82/mdciao/blob/master/doc/imgs/distro_and_violin.png
    :scale: 25%
 
-.. figure:: doc/imgs/timedep_ctc_matrix.png
+.. image:: https://github.com/gph82/mdciao/blob/master/doc/imgs/timedep_ctc_matrix.png
    :scale: 55%
 
-.. figure:: doc/imgs/interface.combined.png
+.. image:: https://github.com/gph82/mdciao/blob/master/doc/imgs/interface.combined.png
    :scale: 33%
 
 ``mdciao`` is a Python module that provides quick, "one-shot" command-line tools to analyze molecular simulation data using residue-residue distances. ``mdciao`` tries to automate as much as possible for non-experienced users while remaining highly customizable for advanced users, by exposing an API to construct your own analysis workflow.