Update blurb about Oceananigans contributors in README and docs (#4886)

Co-authored-by: Navid C. Constantinou <[email protected]>

Author: ali-ramadhan

README.md

@@ -50,7 +50,8 @@ Oceananigans is a fast, friendly, flexible software package for finite volume si
 and hydrostatic Boussinesq equations on CPUs and GPUs.
 It runs on GPUs (wow, [fast!](https://doi.org/10.1029/2024MS004465)), though we believe Oceananigans makes the biggest waves
 with its ultra-flexible user interface that makes simple simulations easy, and complex, creative simulations possible.
-Oceananigans.jl is developed by the [Climate Modeling Alliance](https://clima.caltech.edu) and heroic external collaborators.
+Oceananigans development is community-driven with contributors from academia and industry.
+Testing infrastructure is provided by [atdepth](https://www.atdepth.org) and the [Climate Modeling Alliance](https://clima.caltech.edu).
 
 ## Contents
 

docs/src/index.md

@@ -4,11 +4,10 @@
 
 Oceananigans is a fast, friendly, flexible software package for finite volume simulations of the nonhydrostatic
 and hydrostatic Boussinesq equations on CPUs and GPUs.
-It runs on GPUs (wow, fast!), though we believe Oceananigans makes the biggest waves
+It runs on GPUs (wow, [fast!](https://doi.org/10.1029/2024MS004465)), though we believe Oceananigans makes the biggest waves
 with its ultra-flexible user interface that makes simple simulations easy, and complex, creative simulations possible.
-
-Oceananigans is written in Julia by the [Climate Modeling Alliance](https://clima.caltech.edu)
-and heroic external collaborators.
+Oceananigans development is community-driven with contributors from academia and industry.
+Testing infrastructure is provided by [atdepth](https://www.atdepth.org) and the [Climate Modeling Alliance](https://clima.caltech.edu).
 
 ## Quick install