update pmtiles, maplibre and basemaps deps (#129)

* remove links to joerd, replace with mapterhorn

Author: bdon

basemaps/downloads.md

@@ -44,8 +44,4 @@ If you don't need all 16 zoom levels of detail, use the `--maxzoom` option of `p
 
 The [Mapterhorn](http://mapterhorn.com) project distributes Terrarium-encoded RGB tiles aggregated from multiple global data sources in PMTiles format. Download the full `.pmtiles` or get a partial download with `pmtiles extract` at the [Mapterhorn Data Access documentation](https://mapterhorn.com/data-access/).
 
-### Tilezen Joerd (legacy)
-
-The [AWS Registry of Open Data](https://registry.opendata.aws/terrain-tiles/) hosts Terrarium-encoded RGB tiles generated by the [Joerd](https://github.com/tilezen/joerd) project. Below is a link of zooms 0 to 12 of this tileset, provided as-is. See the [Joerd docs](https://github.com/tilezen/joerd/blob/master/docs/attribution.md) for attribution requirements.
-
-[terrarium-z12.pmtiles](https://r2-public.protomaps.com/protomaps-sample-datasets/terrarium-z12.pmtiles) [(preview)](https://pmtiles.io/?url=https%3A%2F%2Fr2-public.protomaps.com%2Fprotomaps-sample-datasets%2Fterrarium-z12.pmtiles#map=0.7/0/0)
+[planet.pmtiles](https://download.mapterhorn.com/planet.pmtiles) [(preview)](https://pmtiles.io/#url=https%3A%2F%2Fdownload.mapterhorn.com%2Fplanet.pmtiles&map=0.6/0/0)