Rio-viz

* renamed `rio_viz.ressources` to `rio_viz.resources` (https://github.com/developmentseed/titiler/pull/210)
* update and reduce requirements
* fix wrong tilesize setting in UI
* update pre-commit configuration

* update requirements.
* add Mapbox `dark` basemap as default.

* add missing `__init__` in rio_viz.io submodule (https://github.com/developmentseed/rio-viz/pull/24)

* Fix error when `rio-tiler-mvt` is not installed (https://github.com/developmentseed/rio-viz/issues/21)

* update for rio-tiler 2.0.0rc3

* add `--server-only` options and add preview/part API.
* add more output types.