Review client type distribution collection

## Expected Behavior
Currently the crawler is pulling a count for the `Client type distribution` metric which unfortunately does not look accurate in distribution. Other crawlers such as clientdiversity.org is reporting very different distributions using [Miga Labs Armiarma](https://github.com/migalabs/armiarma) and [Sigma Prime's Blockprint](https://github.com/sigp/blockprint) crawlers.

Might be related to #205.

## Current Behavior
Numbers look inaccurate.

## Possible Solution
We should be clear in how we are capturing this metric. It may be good to outline here how this metric is captured and create some sort of tooltip in the UI to explain what is being done to get this number.