Download page of .deb

Hello,
the first method proposed to install influxdb 2 is to directly use wget to get the ".deb". It say: "Download and install the appropriate .deb or .rpm file using a URL from the [InfluxData downloads page](https://portal.influxdata.com/downloads/) with the following commands"
However, on the download page there is no link toward ".deb" but only the way to add Influxdb to repository etc...
It is not so hard to "create" the good link to the ".deb" for wget but it is a little bit confusing.

Suggestion:
add to the download page "ubuntu & debian by dpk" or something like that (the other will be ubuntu & debian by repository maybe) with the appropriate commands like there is for the binary.

##### Relevant URLs
- https://docs.influxdata.com/influxdb/v2.6/install/
- https://portal.influxdata.com/downloads/

Start with the InfluxDB v2.6 install page and the linked InfluxData downloads page. Check how the existing binary and repository instructions are presented, then determine where Debian/Ubuntu .deb download instructions belong. Done means the download guidance clearly includes an appropriate direct .deb method and commands.

Written by the indexing model from the issue text.