replace tilt with radius for k8s deployment

[willtsai]

This pull request updates the Kubernetes deployment instructions for TraderX to use Radius instead of Tilt.dev, streamlining the setup for both local and cloud environments. The changes remove documentation and configuration related to Tilt.dev and improve clarity and guidance for deploying with Radius.

Deploying with Radius has the following advantages:

• Radius is a CNCF project, which means there will be closer alignment with Kubernetes and FINOS
• Deployments using Radius is designed to be platform-agnostic, meaning that users will have a path forward to deploy TraderX to cloud platforms (e.g. EKS, AKS) using Radius

Documentation and Deployment Workflow Update:

• Updated README.md to replace Tilt.dev instructions with steps for deploying TraderX using Radius, including prerequisites, deployment commands, and cleanup instructions. This provides a more modern and production-like workflow for local and cloud deployments.
• Removed the now-obsolete radius-traderx/README.md, which previously contained separate Radius deployment instructions, consolidating all guidance into the main README.md.

Configuration Cleanup:

• Removed the unused workspace configuration from radius-traderx/.rad/rad.yaml, as it is no longer relevant with the updated Radius workflow.

[netlify]

✅ Deploy Preview for lucky-concha-f3599f canceled.

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[willtsai]

I have tested this from scratch on a clean codespace machine and everything is working as expected.

[willtsai]

converting back to draft as I need to work through some things first before this can be reviewed.