Make supported runtime and deployment environments clearer

[pug-despite]

Overview

The cb-mpc repository explains how the library works, but it is not always clear where it is meant to run or which environments are officially supported. Adding this context would make it easier for developers to decide if the library fits their use case.

Problem Description

Developers may not know whether cb-mpc is intended for local development, server-side applications, containerized deployments, or other environments. This lack of clarity can lead to trial-and-error setups or incorrect assumptions during deployment.

Expected Behavior

The documentation should clearly communicate which runtime and deployment environments are supported or recommended. Developers should be able to understand any limitations without digging into the source code.

Solution

Add a short, friendly documentation section that lists supported environments, highlights any constraints, and sets expectations about where the library is best used. The guidance should remain high-level and easy to keep up to date.