Generate more unique project filenames when list isn't a github org

[themightychris]

For project lists other than github orgs, it's possible to have multiple projects with the same repo name

One such example exists under Hack for LA currently:

• https://github.com/hackforla/website
• https://github.com/100Automations/Website

Even worse in this case, it's two different casings for the same word which wrecks havoc in case-incentive environments like Macs

The crawler should, for project list types that aren't org, generate filenames in the for ${organization}--${repository} to ensure uniqueness. Rolling this out would generate a massive set of renames though that could break historical analysis. Maybe this expanded naming could be applied only when collisions are detected instead to minimize historical churn?