docs: Update release notes (#4281)

* docs: Update release notes

* docs: Add new features and deprecations

* docs: Add multiple grant support

* docs: Add permission grant string change

* docs: Add links

* docs: Add list pagination to known issues

* docs: Add storage bucket policy updates

* docs: Clarify worker must be upgraded

website/data/docs-nav-data.json

@@ -1572,6 +1572,10 @@
         "title": "Overview",
         "path": "release-notes"
       },
+      {
+        "title": "v0.15.0",
+        "path": "release-notes/v0_15_0"
+      },
       {
         "title": "v0.14.0",
         "path": "release-notes/v0_14_0"