* Update elasticsearch/kibana instructions
[From elastisearch notes](https://www.elastic.co/guide/en/elasticsearch/reference/current/important-settings.html#heap-size-settings) :
```
By default, Elasticsearch automatically sets the JVM heap size based on a node’s roles and total memory. We recommend the default sizing for most production environments.
```
* Update nginx conf to TLSv1.3 and IPv6
* Replace nginx proxy by native https server
Kibana now provide https web server, remove the nginx proxy part and directly use kibana
* Fix typo
* Add infos how to login to kibana
* Add interface details
