fix(docs): replace identicon logos and deduplicate README database wall (#37500)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.rat-excludes

@@ -67,20 +67,8 @@ temporary_superset_ui/*
 # skip license checks for auto-generated test snapshots
 .*snap
 
-# docs overrides for third party logos we don't have the rights to
-google-big-query.svg
-google-sheets.svg
-ibm-db2.svg
-netlify.png
-postgresql.svg
-snowflake.svg
-ydb.svg
-loading.svg
-apache-solr.svg
-azure.svg
-superset.svg
-
-# docs third-party logos, i.e. docs/static/img/logos/*
+# docs third-party logos (database logos, org logos, etc.)
+databases/*
 logos/*
 
 # docs-related