Correct the published metadata

Adds library_name to the model card, and pipeline_tag where it was missing.
Brings the config and card licenses into agreement, and repairs the variant
declarations that did not match the files actually published here.

README.md

@@ -1,5 +1,7 @@
 ---
 license: apache-2.0
+pipeline_tag: keypoint-detection
+library_name: executorch
 ---
 # Introduction
 

xnnpack/config.json

@@ -6,7 +6,7 @@
     "object-detection"
   ],
   "backend": "xnnpack",
-  "license": "Apache-2.0",
+  "license": "apache-2.0",
   "variants": [
     {
       "file": "blazeface_xnnpack_fp32.pte",
@@ -17,24 +17,38 @@
         "forward": {
           "inputs": [
             {
-              "shape": [1, 3, 256, 256],
+              "shape": [
+                1,
+                3,
+                256,
+                256
+              ],
               "dtype": "float32"
             }
           ],
           "outputs": [
             {
               "name": "boxes",
-              "shape": [896, 4],
+              "shape": [
+                896,
+                4
+              ],
               "dtype": "float32"
             },
             {
               "name": "scores",
-              "shape": [896],
+              "shape": [
+                896
+              ],
               "dtype": "float32"
             },
             {
               "name": "keypoints",
-              "shape": [896, 6, 3],
+              "shape": [
+                896,
+                6,
+                3
+              ],
               "dtype": "float32"
             }
           ]