docs: document Solo theme modifications and code injection state

Removed Powered by Ghost footer via direct theme edit.
Dark theme CSS injection documented.
Font injection documented.

Task #39 in progress — Chronicler #29

docs/tasks/ghost-cms-buildout/deployment-plan.md

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+
+## Theme Modifications (March 13, 2026)
+
+### Solo Theme — default.hbs
+- Removed "Powered by Ghost" from footer (line 101)
+- File: `/var/www/firefrost/content/themes/solo/default.hbs`
+- Command: `sudo sed -i` to replace footer line
+- Ghost restarted after change
+
+### Code Injection — Site Footer
+- Dark theme: `#0A0A0A` background
+- Fire/Frost gradient buttons: `#ff4d00` → `#00E5FF`
+- Orbitron font on headers/buttons
+- All Ghost branding CSS suppressed
+
+### Code Injection — Site Header
+- Google Fonts: Orbitron (700,800) + Inter (400,600)