Update NVIDIA branding

...d/src/components/LLMSelection/NvidiaNimOptions/remote.jsx

frontend/src/media/llmprovider/nvidia-nim.png

frontend/src/pages/GeneralSettings/LLMPreference/index.jsx

...end/src/pages/OnboardingFlow/Steps/DataHandling/index.jsx

...nd/src/pages/OnboardingFlow/Steps/LLMPreference/index.jsx

server/models/systemSettings.js

server/utils/AiProviders/nvidiaNim/index.js

server/utils/agents/aibitat/providers/nvidiaNim.js

server/utils/agents/index.js

server/utils/helpers/customModels.js