Revert "Add feedback request in README" (elastic#1930)

Author: pquentin

README

@@ -24,20 +24,6 @@ Installation
 
   pip install elasticsearch-dsl
 
-Feedback 🗣️
------------
-
-The engineering team here at Elastic is looking for developers to participate in
-research and feedback sessions to learn more about how you use our Python client and
-what improvements we can make to their design and your workflow. If you're interested in
-sharing your insights into developer experience and language client design, please fill
-out this `short form`_. Depending on the number of responses we get, we may either
-contact you for a 1:1 conversation or a focus group with other developers who use the
-same client. Thank you in advance - your feedback is crucial to improving the user
-experience for all Elasticsearch developers!
-
-.. _short form: https://forms.gle/bYZwDQXijfhfwshn9
-
 Examples
 --------