website/style: fix code block bottom margin (#4526)
website/style: fix code block bottom margin (#4526)

The text following regular code blocks was too close. Now, the bottom
margin is the same was used with live-blocks, 1.5rem (24px).

Signed-off-by: Stephan Renatus <0d0a21c7604d0d452d5c1019ca18e48a97a9a057@gmail.com>
tsandall/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa