Bump quartz from a7e2080 to c654690 (#62)

Bumps [quartz](https://github.com/jackyzha0/quartz) from `a7e2080` to `c654690`.
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<summary>Commits</summary>
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<li><a href="https://github.com/jackyzha0/quartz/commit/c6546903f28cf49c573857c620aecc57562c34da"><code>c654690</code></a> fix: reland string coercion in title</li>
<li><a href="https://github.com/jackyzha0/quartz/commit/2c69b0c97d40f76363d20478cb799ce4b7518e56"><code>2c69b0c</code></a> fix: frontmatter coercion (empty string is falsy)</li>
<li>See full diff in <a href="https://github.com/jackyzha0/quartz/compare/a7e20804f5fe68dff7b71f3065f60e2147d633ba...c6546903f28cf49c573857c620aecc57562c34da">compare view</a></li>
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