Better Query on repo.index

## Description and Impact
Changes how repo.index queries for things

## Deploy Plan
> Does Infrastructure need to know anything special about this deploy?

## Rollback Plan
* To roll back this change, revert the merge with: `git revert -m 1 MERGE_SHA` and perform another deploy.

## URLs
> Links to bug tickets or user stories.

## QA Plan
> Fill in scenarios below. Review [QA Best Practices](https://source.sportngin.com/page/show/1227795-qa-best-practices).

#### Risk Level:
- [X] Low
- [ ] Medium
- [ ] High

Rake app:hubstats:setup to build
Checkout that the number of comments and pulls in the active users table add up to the numbers displayed above
The name of this implies that if you call this method you get back a list of users with their comments loaded as well. A better name for this would be `user_comment_counts`. This should also probably be a scope on `Comment` instead of a class method on `User`.