MINOR: remove dangling quickstart-*.html
Reviewers: Guozhang Wang
<h3 class="anchor-heading"><a id="uses" class="anchor-link"></a><a href="#uses">1.2 Use Cases</a></h3>
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<h3 class="anchor-heading"><a id="quickstart" class="anchor-link"></a><a href="#quickstart">1.3 Quick Start</a></h3>
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+ <!--#include virtual="quickstart.html" -->
<h3 class="anchor-heading"><a id="ecosystem" class="anchor-link"></a><a href="#ecosystem">1.4 Ecosystem</a></h3>
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<h3 class="anchor-heading"><a id="upgrade" class="anchor-link"></a><a href="#upgrade">1.5 Upgrading From Previous Versions</a></h3>
