default text improvements + some design options #727

Job	Run time
Build-environments (jupyter-book/introduction/analysis_tools.yml)	40s
Build-environments (jupyter-book/preprocessing_visualization/preprocessing.yml)	1m 5s
Build-environments (jupyter-book/cellular_structure/clustering.yml)	45s
Build-environments (jupyter-book/cellular_structure/annotation.yml)	2m 30s
Build-environments (jupyter-book/cellular_structure/integration.yml)	1m 15s
Build-environments (jupyter-book/conditions/compositional.yml)	2m 33s
Build-environments (jupyter-book/conditions/gsea_pathway.yml)	59s
Build-environments (jupyter-book/conditions/perturbation_modeling.yml)	2m 32s
Build-environments (jupyter-book/conditions/differential_gene_expression.yml)	2m 51s
Build-environments (jupyter-book/trajectories/lineage_tracing.yml)	1m 38s
Build-environments (jupyter-book/trajectories/pseudotemporal.yml)	36s
Build-environments (jupyter-book/mechanisms/cell_cell_communication.yml)	1m 20s
Build-environments (jupyter-book/spatial/spatial.yml)	14m 54s
Build-environments (jupyter-book/surface_protein/surface_protein.yml)	35s
Build-environments (jupyter-book/multimodal_integration/paired_integration.yml)	2m 49s
Build-environments (jupyter-book/multimodal_integration/advanced_integration.yml)	2m 53s
	39m 55s

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