Markdown fixes.

Experiment with GitHub's MD.
Remove links overriding SVG (?)

README.md

@@ -6,14 +6,16 @@ PyJNIus is a [Python](https://www.python.org/) library for accessing
 [Java Native Interface](https://docs.oracle.com/javase/8/docs/technotes/guides/jni/)
 (JNI). 
 
-Warning: the [PyPI](https://pypi.org/) package name is now 
-[pyjnius](https://pypi.org/project/pyjnius/) instead of `jnius`.
-
 PyJNIus is managed by the [Kivy Team](https://kivy.org/about.html) and can be
 used with [python-for-android](https://github.com/kivy/python-for-android). 
 
 It can also be used independently of Kivy, on desktop and mobile platforms. 
 
+> [!WARNING]
+> The [PyPI](https://pypi.org/) package name is now 
+[pyjnius](https://pypi.org/project/pyjnius/) instead of `jnius`.
+
+
 [![Backers on Open Collective](https://opencollective.com/kivy/backers/badge.svg)](#backers)
 [![Sponsors on Open Collective](https://opencollective.com/kivy/sponsors/badge.svg)](#sponsors)
 [![GitHub contributors](https://img.shields.io/github/contributors-anon/kivy/pyjnius)](https://github.com/kivy/pyjnius/graphs/contributors)
@@ -197,18 +199,16 @@ Please consult the [latest Code of Conduct](https://github.com/kivy/pyjnius/blob
 
 This project exists thanks to all the people who contribute.
 [[Become a contributor](CONTRIBUTING.md)].
-<a href="https://github.com/kivy/pyjnius/graphs/contributors"><img src="https://opencollective.com/kivy/contributors.svg?width=890&avatarHeight=45&button=false" /></a>
-
+<img src="https://opencollective.com/kivy/contributors.svg?width=890&avatarHeight=45&button=false">
 
 ## Backers
 
 Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/kivy#backer)]
 
-<a href="https://opencollective.com/kivy#backers" target="_blank"><img src="https://opencollective.com/kivy/backers.svg?width=890&avatarHeight=45&button=false"></a>
-
+<img src="https://opencollective.com/kivy/backers.svg?width=890&avatarHeight=45&button=false">
 
 ## Sponsors
 
 Support this project by becoming a sponsor. [[Become a sponsor](https://opencollective.com/kivy#sponsor)]
 
-<a href="https://opencollective.com/kivy#sponsors" target="_blank"><img src="https://opencollective.com/kivy/sponsors.svg?width=890&avatarHeight=130&button=false"></a>
+<img src="https://opencollective.com/kivy/sponsors.svg?width=890&avatarHeight=130&button=false">