Update AstraQ-VL model card naming and artifact links

Rename Stage-1 artifacts for AstraQ-VL

Add renamed artifact astraq-vl-stage1-full-heldout-eval-v1.zip

Add renamed artifact astraq-vl-stage1-ep3.zip

Add renamed artifact astraq-vl-stage1-ep2.zip

Add renamed artifact astraq-vl-stage1-ep1.zip

Remove legacy artifact filenames after AstraQ-VL rename

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Update README.md

Rename astrollava-stage1-checkpoint-1300.zip to astrollava-stage1-legacy-1epoch-no-heldout-checkpoint-1300.zip

Rename astrollava-stage1-all-checkpoints.zip to astrollava-stage1-legacy-1epoch-no-heldout-all-checkpoints.zip

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initial commit