Add a 'settings' configuration file for the editor

## Overview
This isn't really feature-critical. It's more of a 'nice to have', to make our product more polished.

### Features
- [ ] Toggles for keybindings (vim, emacs, default)

```js
editor.setKeyboardHandler("ace/keyboard/vim");
```

- [ ] Configuration options for snippets
- [ ] Themes for ace editor