render openapi spec client-side

- move spec to _static/rest-api.yml, since the original yaml must be served
- copy javascript rendering code from FastAPI (uses swagger-ui)
- remove link to pet store, since there isn't a big enough difference to duplicate it
- remove bootprint rendering with node

docs/source/conf.py

@@ -215,7 +215,7 @@ if on_rtd:
     # build both metrics and rest-api, since RTD doesn't run make
     from subprocess import check_call as sh
 
-    sh(['make', 'metrics', 'rest-api', 'scopes'], cwd=docs)
+    sh(['make', 'metrics', 'scopes'], cwd=docs)
 
 # -- Spell checking -------------------------------------------------------