Remove unused and outdated Natural Language samples [(#1715)](GoogleCloudPlatform/python-docs-samples#1715)

* remove unused beta entity sentiment samples

* remove unused beta samples

* remove v1beta2 directory

* remove outdated unused tutorial

* removes remaining googleapiclient.discovery tutorials

Author: alixhami

packages/google-cloud-language/samples/snippets/README.md

@@ -10,17 +10,6 @@ This directory contains Python examples that use the
 
 - [api](api) has a simple command line tool that shows off the API's features.
 
-- [movie_nl](movie_nl) combines sentiment and entity analysis to come up with
-actors/directors who are the most and least popular in the imdb movie reviews.
-
-- [ocr_nl](ocr_nl) uses the [Cloud Vision API](https://cloud.google.com/vision/)
-to extract text from images, then uses the NL API to extract entity information
-from those texts, and stores the extracted information in a database in support
-of further analysis and correlation.
-
 - [sentiment](sentiment) contains the [Sentiment Analysis
   Tutorial](https://cloud.google.com/natural-language/docs/sentiment-tutorial)
 code as used within the documentation.
-
-- [syntax_triples](syntax_triples) uses syntax analysis to find
-subject-verb-object triples in a given piece of text.