This commit contains two separate but related changes:
1. A check-list for creating a new experiment.
2. A new experiment along with declaring a winner for the previous experiment.
Below are the diffs of the two new variants versus the incumbent for the
experiment:
```
❯ diff config/feed-variants/20220603-variant-b.json config/feed-variants/20220518-variant.json
3,4c3
< "description": "As 202205518-variant but with modificiation to `order_by` lever.",
< "order_by": "final_order_by_random_weighted_to_score",
---
> "order_by": "relevancy_score_and_publication_date",
```
```
❯ diff config/feed-variants/20220603-variant-a.json config/feed-variants/20220518-variant.json
3d2
< "description": "As 202205518-variant but with modificiation to `matching_positive_tags_intersection_count`.",
69c68
< [0, 0.5],
---
> [0, 0.7],
```
Closesforem/forem#17822
3118f27197