Format and Update Markdown files

[Nirmal4G]

The ReadMe and other markdown files in the repository have not been updated in a long time. Thus, with tools like MarkdownLint there were several issues being reported when editing them.

• Using MarkdownLint or similar tools, fix and format the markdown files
• Replace GitHub emoji identifiers (aka :emoji_id:) with actual emoji symbols

Please do suggest if there any other changes to be made to those files.

[ghost]

Hello Nirmal4G, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible. Other community members may also look into the issue and provide feedback 🙌