Add new Nextstrain clade definitions

[joverlee521]

Context

This is dependent on designation of new clades and the release of a new Nextclade datasets that includes the designations.

Once the ncov-ingest workflow has been run with the new Nextclade dataset, the new clades will be available in the metadata TSV on S3 and will be summarized in the clade counts. If they pass our data thresholds, then they will be included in the model results. Without the clade definition config, the new Nextstrain clades will appear as the default dark grey color in the viz.

Solution

Add the new Nextstrain clades to the config file so that they are labeled and colored appropriately in the forecasts viz.

[joverlee521]

Resolved by #78