Corrected footer button links for Discord and GitHub

[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 addresses a user experience issue in the footer section of the main landing page (index.html) by correcting two broken button links. Previously, both the Discord and "Open an Issue" buttons in the Contact Us section were incorrectly redirecting users to the same GitHub repository URL, which prevented users from accessing the intended Discord community or GitHub issues page.

The changes are minimal and surgical:

• Line 512: Updates the Discord button to point to the official Discord invite (https://discord.gg/NmGyBWAE3b)
• Line 524: Updates the "Open an Issue" button to point to the GitHub issues page (https://github.com/opensource-society/CodeClip/issues)

This fix aligns with the project's community engagement goals, especially important for an open-source project participating in GSSoC 2025. The footer serves as a critical navigation point for users wanting to join the community or report issues, so ensuring these links work correctly directly impacts user engagement and contribution workflows.

Confidence score: 5/5

• This PR is extremely safe to merge with virtually no risk of breaking existing functionality.
• The changes are simple URL corrections in static HTML with no logic changes, dependencies, or potential side effects.
• No files need additional attention - the changes are straightforward and well-targeted.

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