message: WDRC_Plotter index.html: add version for mobile
diff: <title>Tympan_Library Docs</title>
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  -WDRC Plotter is here: <a href='https://tympan.github.io/Tympan_Library/WDRC_Plotter.html'>https://tympan.github.io/Tympan_Library/WDRC_Plotter.html</a>
  +WDRC Plotter is here: <a href='https://tympan.github.io/Tympan_Library/WDRC_Plotter.html'>https://tympan.github.io/Tympan_Library/WDRC_Plotter.html</a> with a version that is maybe better for mobile <a href='https://tympan.github.io/Tympan_Library/WDRC_Plotter_Mobile.html'>here</a> :
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