docs: Change cognee Comparison Image in README file (#1259)

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## Description
<!-- Provide a clear description of the changes in this PR -->
Cognee comparison image updated, has the same name as before. The new
image should be visible when merged with main, since the image link
points to the main branch.

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.
This commit is contained in:
Vasilije 2025-08-15 20:18:35 +02:00 committed by GitHub
commit 4a659edd7e
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