Docs / Quantization: refactor quantization documentation (#30942)

* refactor quant docs

* delete file

* rename to overview

* fix

* fix table

* fix

* add content

* fix library versions

* fix table

* fix table

* fix table

* fix table

* Apply suggestions from code review

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* replace to quantization_config

* fix aqlm snippet

* add DLAI courses

* fix

* fix table

* fix bulet points

---------

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

docs/source/en/_toctree.yml

@@ -135,18 +135,36 @@
     title: Community resources
   - local: troubleshooting
     title: Troubleshoot
-  - local: hf_quantizer
-    title: Contribute new quantization method
   - local: gguf
     title: Interoperability with GGUF files
   title: Developer guides
+- sections:
+  - local: quantization/overview
+    title: Getting started
+  - local: quantization/bitsandbytes
+    title: bitsandbytes
+  - local: quantization/gptq
+    title: GPTQ
+  - local: quantization/awq
+    title: AWQ
+  - local: quantization/aqlm
+    title: AQLM
+  - local: quantization/quanto
+    title: Quanto
+  - local: quantization/eetq
+    title: EETQ
+  - local: quantization/hqq
+    title: HQQ
+  - local: quantization/optimum
+    title: Optimum
+  - local: quantization/contribute
+    title: Contribute new quantization method
+  title: Quantization Methods
 - sections:
   - local: performance
     title: Overview
   - local: llm_optims
     title: LLM inference optimization
-  - local: quantization
-    title: Quantization
   - sections:
     - local: perf_train_gpu_one
       title: Methods and tools for efficient training on a single GPU