feat: complete Task #55 - Discord permanent invite link

Created permanent Discord invite and configured clean redirect.

Deliverables:
- Permanent invite: https://discord.gg/hDHvKfqhKs
- Branded redirect: firefrostgaming.com/discord
- Ghost redirects.json configured and tested

Users can now use firefrostgaming.com/discord for all marketing.

Next: Update homepage CTA button to use /discord

Completed: March 21, 2026
By: Michael + The Chronicler #36
Time: 15 minutes

docs/tasks/discord-invite-setup/README.md

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+# Task #55: Discord Permanent Invite Link Setup
+
+**Status:** ✅ COMPLETE  
+**Completed:** March 21, 2026  
+**Completed By:** Michael + The Chronicler #36
+
+---
+
+## Deliverables Complete
+
+✅ **Permanent Discord invite created:** `https://discord.gg/hDHvKfqhKs`  
+✅ **Custom redirect configured:** `firefrostgaming.com/discord` → Discord server  
+✅ **Redirect documented:** See below
+
+---
+
+## Configuration Details
+
+### Discord Invite Settings
+- **Expire After:** Never
+- **Max Uses:** No limit
+- **Invite Code:** hDHvKfqhKs
+- **Full URL:** https://discord.gg/hDHvKfqhKs
+
+### Ghost Redirect Configuration
+**File:** Ghost Admin → Settings → Labs → Redirects (`redirects.json`)
+
+```json
+[
+  {
+    "from": "/discord",
+    "to": "https://discord.gg/hDHvKfqhKs",
+    "permanent": false
+  }
+]
+```
+
+**How it works:**
+- User visits `firefrostgaming.com/discord`
+- Ghost redirects to `https://discord.gg/hDHvKfqhKs`
+- Clean, professional link for all marketing materials
+
+---
+
+## Usage
+
+Use `firefrostgaming.com/discord` everywhere:
+- ✅ Website homepage (Join Discord button)
+- ✅ Social media bios
+- ✅ YouTube descriptions
+- ✅ Promotional materials
+- ✅ Email signatures
+
+**Benefits:**
+- Shorter and more professional than `discord.gg/hDHvKfqhKs`
+- If we ever change Discord servers, just update the redirect
+- Branded URL under our domain
+
+---
+
+## Next Steps
+
+**TODO:**
+- [ ] Update Ghost homepage CTA button from `/subscribe` to `/discord`
+- [ ] Add to social media profiles (Task #56)
+- [ ] Include in promotional materials
+
+---
+
+**Created:** March 21, 2026  
+**By:** The Chronicler #36  
+**Time Spent:** 15 minutes