- Refactor config index to expose a different method for getting the config called `getConfig`. This now takes a app name (context) as a string which may return a subset of config values appropriate for a given application such as the "sidebar" or "notebook".
- Segregate the config keys into various app contexts and omit keys that are either not used in a given application context or need to be excluded (e.g. `annotations` in notebook)
- Fix missing config appType in annotator/config/index so it can propagate to the sidebar property (this was previously not the case)
- Remove assetRoot from annotator/config/index as it is only needed in boot and not any specific app context