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.

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

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