* Change EULA to SSLA
- rename i18n fields
- update the config property to `ssla` and deprecate `eula`
- use `eula` instead of ssla in case it is provided in the config.
* fix default config
* completely remove eula fallback
The other options are things people usually won't need or want to
set, so just keep it to the basics.
* Rename config sample to match element-web
* Update / simplify build instructions
* Rename nginx config file to differentiate it from EC config