Improve metadata and add paper link

This PR improves the model card by adding a link to the paper and ensuring the metadata is correctly filled in. More specifically, the `library_name` is set to `diffusers` and the `pipeline_tag` is set to `image-to-image` so that the model can be easily discoverable.

README.md

@@ -1,11 +1,11 @@
 ---
-license: other
+base_model:
+- stable-diffusion-v1-5/stable-diffusion-v1-5
 language:
 - en
-pipeline_tag: image-to-image
 library_name: diffusers
-base_model:
-- stable-diffusion-v1-5/stable-diffusion-v1-5
+license: other
+pipeline_tag: image-to-image
 ---
 
 # BlobCtrl