feat(docs): add zodb-convert logo to ecosystem dashboard

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jensens

docs/sources/_static/logo-zodb-convert.png

@@ -46,6 +46,7 @@ layout: landing
 
 - repo: bluedynamics/zodb-convert
   pypi: zodb-convert
+  icon: https://bluedynamics.github.io/zodb-pgjsonb/_static/logo-zodb-convert.png
   group: Tools & Libraries
   description: Generic ZODB storage conversion tool