Add Discord community guidelines preview

[RishiByte]

Add a Community Guidelines Preview

Goal

Help visitors understand the purpose and culture of the DemonDie Discord community before they join.

Acceptance Criteria

• Add a short community guidelines preview containing 3–4 concise bullet points.
• Keep the messaging friendly, welcoming, and focused on student developers.
• Place the guidelines near the Community or Contribute section.
• Ensure the content encourages respectful collaboration and learning.
• Maintain consistency with the site's existing design and tone.

Expected Outcome

Visitors should gain a quick understanding of what to expect from the community and feel more confident about joining and participating.

Additional Notes

• Keep the guidelines concise and easy to scan.
• Focus on collaboration, learning, respect, and open-source contribution.
• Avoid lengthy rules or moderation policies; this section should serve as a brief introduction rather than full documentation.