Docs: change readme.rst to README.md, as Gitea can't render rst

readme.rst → README.md

-
-.. Keep this document short & concise,
-   linking to external resources instead of including content in-line.
-   See 'release/text/readme.html' for the end user read-me.
-
+<!--
+Keep this document short & concise,
+linking to external resources instead of including content in-line.
+See 'release/text/readme.html' for the end user read-me.
+-->
 
 Blender
 =======
@@ -11,25 +11,22 @@ Blender is the free and open source 3D creation suite.
 It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing,
 motion tracking and video editing.
 
-.. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg
-   :scale: 50 %
-   :align: center
-
+![Blender screenshot](https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg "Blender screenshot")
 
 Project Pages
 -------------
 
-- `Main Website <http://www.blender.org>`__
-- `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__
-- `User Community <https://www.blender.org/community/>`__
+- [Main Website](http://www.blender.org)
+- [Reference Manual](https://docs.blender.org/manual/en/latest/index.html)
+- [User Community](https://www.blender.org/community/)
 
 Development
 -----------
 
-- `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__
-- `Code Review & Bug Tracker <https://developer.blender.org>`__
-- `Developer Forum <https://devtalk.blender.org>`__
-- `Developer Documentation <https://wiki.blender.org>`__
+- [Build Instructions](https://wiki.blender.org/wiki/Building_Blender)
+- [Code Review & Bug Tracker](https://developer.blender.org)
+- [Developer Forum](https://devtalk.blender.org)
+- [Developer Documentation](https://wiki.blender.org)
 
 
 License
@@ -38,4 +35,4 @@ License
 Blender as a whole is licensed under the GNU General Public License, Version 3.
 Individual files may have a different, but compatible license.
 
-See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.
+See [blender.org/about/license](https://www.blender.org/about/license) for details.