Corrected footer button links for Discord and GitHub Issues

[nehahter]

Closes the issue #211
This PR fixes the incorrect redirection of two footer buttons, the "Discord" and "Open an Issue" under Contact Us in the footer:

• Discord now correctly opens the official Discord invite: https://discord.gg/NmGyBWAE3b
• Open an Issue now takes users to the issues tab of the GitHub repo: https://github.com/opensource-society/CodeClip/issues

[greptile-apps]

Greptile Summary

This PR fixes two incorrect footer button links in the Contact Us section of the main landing page (index.html). The changes address user experience issues where both the Discord and "Open an Issue" buttons were incorrectly pointing to the main GitHub repository URL instead of their intended destinations.

The specific corrections made are:

• Discord button: Now points to the official Discord invite link (https://discord.gg/NmGyBWAE3b) instead of the GitHub repository
• Open an Issue button: Now directs users to the GitHub issues page (https://github.com/opensource-society/CodeClip/issues) instead of the main repository

These changes align with standard footer contact section patterns where each button serves its specific purpose. The Discord button enables community engagement through the project's chat platform, while the issue button provides a direct path for users to report bugs or request features. This improves the overall user journey by ensuring users can easily access the appropriate communication channels for different types of engagement with the CodeClip project.

Confidence score: 5/5

• This PR is extremely safe to merge with no risk of breaking functionality
• Simple URL corrections with no code logic changes, security implications, or potential for runtime errors
• No files need additional attention - the changes are straightforward and well-targeted

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