Update pipeline diagram

Update README: align benchmark names and categories with paper

Update README: replace experiment tables with images, update benchmark list

Update README: add What's New section, unify pp notation for scores

Add pp (percentage point) unit to improvement scores in README

Move abstract section to top of README

Update README: fix links, rename Layer labels, and update UltraData reference URL

Rename UltraData-Math-L2 to UltraData-Math-L2-preview

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