doc: Nukes influxdb.md because influx support has been nuked.

doc/influxdb.md

-# Overview
-Jitsi Meet supports logging to an [InfluxDB](http://influxdb.com/) database.
-
-# Configuration
-The following needs to be done to enable this functionality.
-
-## Install InfluxDB
-The details are outside the scope of the document, see http://influxdb.com/download/ .
-
-## Create an InfluxDB database
-Use the InfluxDB admin interface (running on port 8083) and create a database. In this example we name it <code>jitsi_database</code>
-
-## Enable logging for Jitsi Videobridge
-Add the following properties to <code>/usr/share/jitsi-videobridge/.sip-communicator/sip-communicator.properties</code>.
-
-- org.jitsi.videobridge.log.INFLUX_DB_ENABLED=true
-- org.jitsi.videobridge.log.INFLUX_URL_BASE=http://influxdb.example.com:8086
-- org.jitsi.videobridge.log.INFLUX_DATABASE=jitsi_database
-- org.jitsi.videobridge.log.INFLUX_USER=user
-- org.jitsi.videobridge.log.INFLUX_PASS=pass
-
-## Enable logging for Jicofo
-Add the same properties as above to <code>/usr/share/jicofo/.sip-communicator/sip-communicator.properties</code>.
-
-## Enable logging for Jitsi Meet itself
-Change "logStats" to "true" in <code>/etc/jitsi/meet/you-domain.config.js</code> or the <code>config.js</code> file used in your installation.
-
-# User interface
-You can explore the database using the [Jiloin](https://github.com/jitsi/jiloin) web interface.