fix(readme): update Discord badge to static badge

[echobt]

Changes

• Replace dynamic Discord member count badge with static badge
• The previous badge used a placeholder server ID (1234567890) which didn't display correctly
• All links remain correct:
  • Discord: discord.gg/cortexfoundation ✅
  • Releases: https://github.com/CortexLM/cortex/releases ✅

Before

The Discord badge showed invalid/broken member count due to fake server ID.

After

Static Discord badge that displays correctly and links to the correct Discord server.

[greptile-apps]

Greptile Overview

Greptile Summary

This PR fixes a broken Discord badge in the README by replacing a dynamic member count badge (which used a placeholder server ID 1234567890) with a static badge that displays "Join Us".

• The Discord invite link remains correctly pointed to discord.gg/cortexfoundation
• The badge now displays properly instead of showing an error or invalid data
• All styling (color 5865F2, flat-square style, Discord logo) is preserved
• This is a documentation-only change with no code impact

Confidence Score: 5/5

• This PR is completely safe to merge with zero risk
• The change is trivial and only affects README badge display - no code, dependencies, or functionality is modified
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Replaced dynamic Discord badge with static badge, fixing broken placeholder server ID

Sequence Diagram

sequenceDiagram
    participant User
    participant GitHub
    participant README
    participant ShieldsBadge as shields.io Badge Service
    participant Discord

    User->>GitHub: Visit repository page
    GitHub->>README: Load README.md
    README->>ShieldsBadge: Request static Discord badge
    Note over ShieldsBadge: Generates badge with<br/>"Join Us" text
    ShieldsBadge-->>README: Return badge image
    README-->>GitHub: Display badge
    GitHub-->>User: Show repository with badge
    User->>README: Click Discord badge
    README->>Discord: Redirect to discord.gg/cortexfoundation
    Discord-->>User: Join Discord server

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[greptile-apps]

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