Remove catalog integration for Nix and Solidity languages

Co-authored-by: HerringtonDarkholme <[email protected]>

Author: Copilot

website/src/catalog/data.ts

@@ -48,11 +48,9 @@ export const languages = {
   html: 'HTML',
   java: 'Java',
   kotlin: 'Kotlin',
-  nix: 'Nix',
   python: 'Python',
   ruby: 'Ruby',
   rust: 'Rust',
-  solidity: 'Solidity',
   tsx: 'TSX',
   typescript: 'TypeScript',
   yaml: 'YAML',