Remove specific account references from public documentation

- Replace FETCHERPAY with generic CUSTOM account examples
- Update README.md, .env.example, and DEPLOY.md with generic configurations
- Remove hardcoded IPs, email addresses, and domain names
- Update package.json description to be more generic

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "hermes-mcp",
   "version": "1.0.0",
-  "description": "Yahoo Mail MCP server for Claude AI",
+  "description": "Multi-account email MCP server for Claude AI",
   "type": "module",
   "main": "dist/index.js",
   "scripts": {