Improve README: fix typos, enhance links, and improve clarity

[hasnainmakada-99]

📇 Changes proposed

This PR improves the README.md file with several enhancements:

• Fixed HTML typos: Corrected mismatched h1/h2 tags in the main title
• Fixed spelling and grammar: Corrected "maitainers" to "maintainers" and added missing "to" in sentence
• Enhanced file references: Updated links to use relative paths (./Contributors.md, ./LICENSE, ./how-to-add-resources.md) for better navigation
• Improved Features section: Added bold headings and more engaging, descriptive language
• Standardized Discord links: Ensured consistency across all Discord invite links

✅ Check List

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• This PR contains changes in the documentation
• This PR contains changes in the Code of the project
• The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

These changes improve the overall quality and user experience of the README without changing any functionality. All links have been tested to ensure they work correctly with relative paths.

📷 Screenshots

N/A - Text-only changes to README.md

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