feat: doc improvements

[jaime-iobermudez]

Description:

This pull request contains several documentation and configuration improvements aimed at clarifying setup steps and ensuring consistency in naming and instructions. The most notable changes include correcting the product name throughout the documentation and updating environment file references to match the actual files in the project.

This PR fixes #1476

Documentation and Naming Consistency:

• Changed all instances of "Stable Coin Studio" to "Stablecoin Studio" in both the Docusaurus configuration (apps/docs/docusaurus.config.ts) and navbar title to ensure consistent branding. [1] [2]

Setup Instruction Updates:

• Updated instructions in documentation/gettingStarted/quick-start.md and documentation/web/quick-start.md to use .env.sample instead of .env.example for environment variable setup, reflecting the correct file present in the repository. [1] [2]
• Clarified that the app should be started from the apps/web directory in the quick start guide for better developer guidance.
• Added an explicit npm install step before running the documentation site to ensure all dependencies are installed.

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[swirlds-automation]

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[luigi-io]

Great job!

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