refactor(docs): remove codesponsor

Author: h2non

README.rst

@@ -7,12 +7,6 @@ and binary comparison operators, as defined in the original `JSONPath proposal`_
 This packages merges both `jsonpath-rw`_ and `jsonpath-rw-ext`_ and
 provides several AST API enhancements, such as the ability to update or removes nodes in the tree.
 
-.. raw:: html
-
-    <a target='_blank' rel='nofollow' href='https://app.codesponsor.io/link/1MpD3pzt63uUeG43NP4tDHPY/h2non/jsonpath-ng'>
-      <img alt='Sponsor' width='888' height='68' src='https://app.codesponsor.io/embed/1MpD3pzt63uUeG43NP4tDHPY/h2non/jsonpath-ng.svg' />
-    </a>
-
 About
 -----