Docs: add deploy notes to README

README.md

@@ -54,9 +54,17 @@ something like the following near the end:
 
 ```
 PLAY RECAP ************************************
-openstates.org             : ok=41   changed=6
+openstates.org             : ok=41   changed=6]
 ```
 
+### Deploy issues
+
+* When changing something in JS, such as the mapbox toke in configuration, at least sometimes you can end up with old
+  code still being generated/existing in JS bundles generated by webpack. At least once it was necessary to delete
+  the bundle folders and re-run `npm run build` and the django `collectstatic` commands.
+* Caching appears to happen somewhere between `nginx` and `uwsgi`. If still seeing "old" content, try restarting both
+  with `systemctl`
+
 ## Links
 
 * [Issues](https://github.com/openstates/issues/issues)