chore: upgrade to OpenSeaDragon 3
Test the upgrade with e.g. this manifest: https://ahiqar.uni-goettingen.de/api/textapi/ahikar/syriac/3r678/manifest.json
closes #361 (closed)
Test the upgrade with e.g. this manifest: https://ahiqar.uni-goettingen.de/api/textapi/ahikar/syriac/3r678/manifest.json
closes #361 (closed)