[new page] how to file bug reports

[jackzampolin]

Originally: https://github.com/influxdb/influxdb.com/issues/257

I like https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Troubleshooting.md#troubleshooting as an example.

[rkuchan]

We do have a contributing.md file - we should link to it somewhere in the actual docs.

[beckettsean]

not many contributors get it wrong for simple edits, and we have the GHI template now to help with bug reports.