Integrate: Naming things. Simplify directory layout.

Apache and Amazon/AWS products have been prefixed before. However, while
initially planned to be a good idea, it implicitly added an overlay
subgroup to this flat list.

On the one hand intended, it turned out to be cumbersome to navigate,
both when authoring, and when browsing / exploring the list on behalf
of the URL layout, or other interfaces.

So, let's strip all the prefixes, where the product name is feasible to
be better used standalone.

Author: amotl

docs/integrate/index.md

@@ -36,8 +36,8 @@ hop/index
 iceberg/index
 influxdb/index
 kafka/index
-kinesis/index
 kestra/index
+kinesis/index
 langchain/index
 llamaindex/index
 marquez/index