remove empty bibliography

content/zettels/time_delay.md

@@ -76,9 +76,3 @@ At the Nyquist frequency (5 kHz), the phase lag is 180 degrees.
 {{< figure src="/ox-hugo/time_delay_induced_phase_lag.png" caption="<span class='figure-number'>Figure 1: </span>Phase lag induced by a time delay" >}}
 
 </div>
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-## Bibliography {#bibliography}
-
-<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
-</div>