Bump quartz from 015b4f6 to c9ac2a7 (#104)

Bumps [quartz](https://github.com/jackyzha0/quartz) from `015b4f6` to `c9ac2a7`.
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<summary>Commits</summary>
<ul>
<li><a href="https://github.com/jackyzha0/quartz/commit/c9ac2a7507e42041fefe337f9328e6dc1281a9ff"><code>c9ac2a7</code></a> pkg: bump to 4.1.5</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/7ca491bc1d918e86a97f27597389e269bae523db"><code>7ca491b</code></a> fix: add polyfill for broken tabindex on mac</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/4edd27d3f9510745ceee52a3e37409d8f943e5f2"><code>4edd27d</code></a> fix: font weight in search</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/2c8d0f8ab60cbf2e5e5338709e63267d466fb068"><code>2c8d0f8</code></a> fix: more robust ofm comment handling</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/cd826fb4774795004bfba1b5edd0f2fc8b4b435c"><code>cd826fb</code></a> fix: process comments at a text level rather than a markdown level</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/273931d25c73932abe810c97ecb424a387ada065"><code>273931d</code></a> fix: breadcrumbs on non-folder pages</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/0403fa70aa24cd3c16fbd9caf434cdcd277f1a14"><code>0403fa7</code></a> fix(search): use anchor element (closes <a href="https://redirect.github.com/jackyzha0/quartz/issues/698">#698</a>) (<a href="https://redirect.github.com/jackyzha0/quartz/issues/717">#717</a>)</li>
<li>See full diff in <a href="https://github.com/jackyzha0/quartz/compare/015b4f6a15da3b81f9e3ad004aa24636ab3882ed...c9ac2a7507e42041fefe337f9328e6dc1281a9ff">compare view</a></li>
</ul>
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