Adapt config files for next release

[janCstoffregen]

together with @domsteinbach

• Adapt received files
• nginx file
• lua sipi no thumbnails Salsah shows only thumbnails #1 related
• External adress in Knora webapi sipi extern ändern, beim deployment, nur für produktivumgebung

[domsteinbach]

For allowing nginx to handle files bigger than 2MB and for preventing timeouts we stored the following params in an own config file (/etc/nginx/config.d/my_proxy.conf; in proxy container)

• "server_tokens off;"
• "client_max_body_size 20m;"
• "proxy_connect_timeout 2500s;
• "proxy_send_timeout 2500;"
• "proxy_read_timeout 2500;"

[domsteinbach]

External adress in Knora webapi sipi extern ändern, beim deployment, nur für produktivumgebung

We will adjust this for each productive deployment together with all other params. The preferably should be configurated for local usage at the moment.