Make maintenance only status more prominent

Author: nicoddemus

README.rst

@@ -1,11 +1,12 @@
-.. warning::
-  
-  execnet is currently not maintained
-
-
 execnet: distributed Python deployment and communication
 ========================================================
 
+Important
+---------
+
+**execnet currently is in maintenance-only mode, mostly because it is still the backend
+of the pytest-xdist plugin. Do not use in new projects.**
+
 .. image:: https://img.shields.io/pypi/v/execnet.svg
     :target: https://pypi.org/project/execnet/
 

doc/index.rst

@@ -3,6 +3,12 @@
 .. image:: _static/pythonring.png
    :align: right
 
+
+.. warning::
+
+    execnet currently is in maintenance-only mode, mostly because it is still the backend
+    of the pytest-xdist plugin. Do not use in new projects.
+
 Python_ is a mature dynamic language whose interpreters can interact with
 all major computing platforms today.