chore(showcase): Add bettercap (#3545)

Co-authored-by: Chris Swithinbank <[email protected]>

Author: jacobdalamb

docs/src/assets/showcase/bettercap.org.png

@@ -213,4 +213,5 @@ import FluidGrid from './fluid-grid.astro';
 	<Card title="lychee" href="https://lychee.cli.rs/" thumbnail="lychee.cli.rs.png" />
 	<Card title="Biome" href="https://biomejs.dev/" thumbnail="biomejs.dev.png" />
 	<Card title="aspire.dev" href="https://aspire.dev/" thumbnail="aspire.dev.png" />
+	<Card title="bettercap" href="https://www.bettercap.org/" thumbnail="bettercap.org.png" />
 </FluidGrid>