[text analytics] avoid python config duplication (#12816)

* avoid python ta config duplication

* remove all python blocks from main readme

Author: iscai-msft

specification/cognitiveservices/data-plane/TextAnalytics/readme.md

@@ -132,33 +132,8 @@ csharp:
 ```
 
 ## Python
- 
-These settings apply only when `--python` is specified on the command line.
-Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
-Use `--python-mode=update` if you already have a setup.py and just want to update the code itself.
-
-``` yaml $(python)
-python-mode: create
-python:
-  license-header: MICROSOFT_MIT_NO_VERSION
-  add-credentials: true
-  payload-flattening-threshold: 2
-  namespace: azure.cognitiveservices.language.textanalytics
-  package-name: azure-cognitiveservices-language-textanalytics
-  clear-output-folder: true
-```
 
-``` yaml $(python) && $(python-mode) == 'update'
-python:
-  no-namespace-folders: true
-  output-folder: $(python-sdks-folder)/cognitiveservices/azure-cognitiveservices-language-textanalytics/azure/cognitiveservices/language/textanalytics
-```
-
-``` yaml $(python) && $(python-mode) == 'create'
-python:
-  basic-setup-py: true
-  output-folder: $(python-sdks-folder)/cognitiveservices/azure-cognitiveservices-language-textanalytics
-```
+See configuration in [readme.python.md](./readme.python.md)
 
 ## Go