Add template files for languages, frameworks, IDEs, OS, and tools

src/templates/languages/javascript.gitignore

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+# JavaScript / Node.js
+node_modules/
+jspm_packages/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Build outputs
+dist/
+build/
+.next/
+out/
+
+# Coverage
+coverage/
+
+# Misc
+.DS_Store
+*.pem
+
+# Debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Local env files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Vercel
+.vercel
+
+# TypeScript
+*.tsbuildinfo
+
+# Pnpm
+.pnpm-store/
+
+# Bun
+.bun-cache/
+.bun.lockb
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock