chore: remove Perplexity MCP server configuration (#287)

Removed Perplexity AI model provider from MCP configuration This PR removes the Perplexity AI model provider from the `.mcp.json` configuration file. The change eliminates the Perplexity stdio handler and its associated API key environment variable.

Author: jumski

.mcp.json

@@ -19,14 +19,6 @@
  "name": "sequentialthinking",
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/server-sequential-thinking"]
- },
- "perplexity": {
- "type": "stdio",
- "command": "npx",
- "args": ["-y", "@perplexity-ai/mcp-server"],
- "env": {
- "PERPLEXITY_API_KEY": "${PERPLEXITY_API_KEY}"
- }
  }
  }
 }