Looker: address Snowplow-specific code

[alexanderdean]

The Looker web block contains some Snowplow-specific code, eg:

AND a.page_urlhost IN ('snowplowanalytics.com', 'discourse.snowplowanalytics.com')

I don't know enough about Looker blocks to know the best way forwards, but some options might be:

1. Delete the Snowplow-isms
2. Parameterise the Snowplow-isms (assuming Looker supports parameters)
3. Write some documentation explaining how to manually edit the block and change the Snowplow-isms to values that make sense for you

[carabaestlein]

I would go for option 1!