📄🔧：ensure no gap btwx stab-index banner & hero img

The gap (unneeded) is more visible/intolerable on mobile.

Should be kept in mind when designing stability banner assets.

Refs: https://github.com/OpenINF/open.inf.is/issues/68

Signed-off-by: Derek Lewis <[email protected]>

Author: DerekNonGeneric

README.md

@@ -1,7 +1,6 @@
 <div align="center">
 
 [!['Tesselation of swarm of cicadas flying into school of fish and translating into flying doves'][main-readme-hero]][main-readme-hero-url]
-<br />
 [![Orange banner indicating a preview software component][release-level-banner--unstable]](##)
 
 </div>