fix default logo #371

Job	Run time
get-non-cloud-notebooks	5s
notebooks-except-cloud (docs/sphinx/source/getting-started-pyvespa.ipynb)	11m 14s
notebooks-except-cloud (docs/sphinx/source/reads-writes.ipynb)	6m 52s
notebooks-except-cloud (docs/sphinx/source/advanced-configuration.ipynb)	8m 39s
notebooks-except-cloud (docs/sphinx/source/examples/evaluating-with-snowflake-arctic-embed.ipynb)	5m 22s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical.ipynb)	6m 2s
notebooks-except-cloud (docs/sphinx/source/examples/pyvespa-examples.ipynb)	7m 21s
notebooks-except-cloud (docs/sphinx/source/examples/cross-encoders-for-global-reranking.ipynb)	5m 58s
notebooks-except-cloud (docs/sphinx/source/examples/multi-vector-indexing.ipynb)	8m 37s
notebooks-except-cloud (docs/sphinx/source/examples/feed_performance.ipynb)	12m 17s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical-mapping.ipynb)	7m 51s
notebooks-except-cloud (docs/sphinx/source/application-packages.ipynb)	7m 0s
notebooks-except-cloud (docs/sphinx/source/query.ipynb)	5m 32s
	1h 32m 50s

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