remove experimental related document and code (#2207)

* remove experimental

Signed-off-by: Xin He <xinhe3@habana.ai>

* remove docs (#2206)

Signed-off-by: yiliu30 <yi4.liu@intel.com>

---------

Signed-off-by: Xin He <xinhe3@habana.ai>
Signed-off-by: yiliu30 <yi4.liu@intel.com>
Co-authored-by: Xin He <xinhe3@habana.ai>
Co-authored-by: Yi Liu <yi4.liu@intel.com>

Author: 3 people

docs/source/2x_user_guide.md

@@ -67,7 +67,7 @@ This part provides the advanced topics that help user dive deep into Intel® Neu
 <td colspan="6" align="center"><a href="add_new_adaptor.md">Add New Adaptor</a></td>
 </tr>
 <tr>
-<td colspan="3" align="center"><a href="distillation_quantization.md">Distillation for Quantization</a></td>
+<td colspan="3" align="center"><a href="distillation.md">Distillation</a></td>
 <td colspan="3" align="center"><a href="smooth_quant.md">SmoothQuant</a></td>
 <td colspan="3" align="center"><a href="quantization_weight_only.md">Weight-Only Quantization</a></td>
 <td colspan="3" align="center"><a href="quantization_layer_wise.md">Layer-Wise Quantization</a></td>