docs: fix error in README code snippet

[ilechuks73]

Corrected an error in the Github NPX code snippet within the README file to ensure accuracy and usability. The updated snippet aligns with the intended functionality and improves developer experience.

Description

After copying the code snippet for the github server with NPX execution, i started getting linting errors until i compared with docker snippet and notices the difference in the location of the env key

Server Details

• Server:
• Changes to:

Motivation and Context

For a first timer, it is very difficult to spot this error and took patience and me rereading the docs to spot it since claude desktop error message is of no help

How Has This Been Tested?

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

None

[nyarundapeter]

Great work on addressing the issue and implementing the fix.
I was just about to make a similar PR.
The code works as expected and Github connects as expected.