Add mpox as the default monkeypox URL prefix

[jameshadfield]

All 3 current /mpox datasets (/mpox/lineage-B.1, /mpox/clade-IIb, /mpox/all-clades) are added to the manifest (and thus Auspice's dropdowns), with the last one set as the default. The card on the main splash page is switched to /mpox.

Context (slack): https://bedfordlab.slack.com/archives/C03G8HQEV18/p1695508115055009

The original /monkeypox/* URLs are left unchanged however we can remove these and add redirects instead if we wish to. Steps to do so:

• Removing monkeypox from the (committed) manifest JSON will remove it from the auspice sidebar dropdowns and stop the ability for default URL redirects such as 'monkeypox' → 'monkeypox/hmpxv1'
• Removing /monkeypox from app.js will stop nextstrain.org/monkeypox URLs working at all (they'll 404)
• Redirects to go from /monkeypox URLs to /mpox ones should be added in ./src/redirects.js. All the dataset names have changed (i.e. it's not just /monkeypox/mpox/) so we should add explicit redirects for all the old URLs.

[corneliusroemer]

Looks good, you chose to default to all-clade which is fine I guess, though most mpox these days is clade-IIb so we might also want to choose that. But this decision not blocking and easily changed later.

[jameshadfield]

most mpox these days is clade-IIb so we might also want to choose that

Force-pushed to change the default to clade-IIb

[corneliusroemer]

Test work! Let's merge :)

But shall we also rename the tile from monkeypox to mpox?

https://nextstrain-s-manifest-m-n73mf6.herokuapp.com/mpox/all-clades

[jameshadfield]

Redirects added, as per @corneliusroemer's suggestion.

/monkeypox/mpxv → /mpox/all-clades
/monkeypox/hmpxv1 → /mpox/clade-IIb
/monkeypox/hmpxv1/big → /mpox/lineage-B.1

While the monkeypox option no longer exists in the auspice sidebar, valid URLs will still work, e.g. /monkeypox/hmpxv1/2022-09-04