docs: include openapi.json (#20760)

docs/.gitignore

@@ -18,4 +18,6 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
-yarn.lock
+yarn.lock
+
+/static/openapi.json

docs/package.json

@@ -7,7 +7,8 @@
     "format": "prettier --check .",
     "format:fix": "prettier --write .",
     "start": "docusaurus start --port 3005",
-    "build": "docusaurus build",
+    "copy:openapi": "jq -c < ../open-api/immich-openapi-specs.json > ./static/openapi.json || exit 0",
+    "build": "npm run copy:openapi && docusaurus build",
     "swizzle": "docusaurus swizzle",
     "deploy": "docusaurus deploy",
     "clear": "docusaurus clear",