Fix Docker Image Name and Update Setup Instructions (#44)

[anxkhn]

Description

This update fixes the issue of Docker not pulling the latest image (#44). The Docker image name has been corrected from fake-api to india-api. Additionally, instructions for setting up Docker locally and using the Containerfile have been updated, along with the inclusion of a .dockerignore file to optimize the Docker build process.

Changes:

• Added a .dockerignore file to exclude unnecessary files from the Docker build context.
• Updated the README with correct Docker image name and instructions for local setup using the Containerfile.
• Adjusted Docker-related documentation to reflect the updated process.

Fixes #44.

How Has This Been Tested?

• Verified Docker pull with the corrected image name: ghcr.io/openclimatefix/india-api:latest.
• Tested building and running the Docker image locally using the Containerfile.

Checklist:

• Code follows [OCF's coding style guidelines](https://github.com/openclimatefix/.github/blob/main/coding_style.md).
• Performed a self-review of the code.
• Updated documentation to reflect changes.
• Verified that the .dockerignore file optimizes the build context.
• Tested Docker pull and local build functionality.