Update documentation

Author: shirubana

README.html

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-<li class="toctree-l1"><a class="reference internal" href="PBL%201%20-%20Repowering%20a%20Commercial%20Site.html">C&amp;I Case Study</a></li>
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-<li class="toctree-l1"><a class="reference internal" href="PBL%202%20-%20Residential%20Repower.html">Residential Repowering Scenario</a></li>
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-<li class="toctree-l1"><a class="reference internal" href="PBL%203%20-%202nd%20Life%20Resi.html">Residential Repowering Scenario</a></li>
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-<li class="toctree-l1"><a class="reference internal" href="PBL%204%20-%202nd%20Life%20Owner%20School.html">Second Life Owner School Case Study</a></li>
+<li class="toctree-l1"><a class="reference internal" href="PBL%201%20-%20Repowering%20a%20Commercial%20Site.html">PBL 1 - Repowering a Commercial Site</a></li>
+<li class="toctree-l1"><a class="reference internal" href="PBL%202%20-%20Residential%20Repower.html">PBL 2 - Residential Repower</a></li>
+<li class="toctree-l1"><a class="reference internal" href="PBL%203%20-%202nd%20Life%20Resi.html">PBL 3 - 2nd Life Resi</a></li>
+<li class="toctree-l1"><a class="reference internal" href="PBL%204%20-%202nd%20Life%20Owner%20School.html">PBL 4 - 2nd Life Owner School</a></li>
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