message: Add hexagon_delegate guide to tflite guide page. Also removes tags which doesn't render correctly on the page.
diff: @@ -78,6 +78,8 @@ upper_tabs:
  path: /lite/performance/gpu
  - title: "Advanced GPU"
  path: /lite/performance/gpu_advanced
  + - title: "Hexagon delegate"
  + path: /lite/performance/hexagon_delegate
  - title: "Quantization specification"
  path: /lite/performance/quantization_spec
  