Let docs get version from zedenv module

doc/source/conf.py

@@ -17,11 +17,11 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 #
-# import os
-# import sys
-# sys.path.insert(0, os.path.abspath('.'))
-
+import os
+import sys
+sys.path.insert(0, os.path.abspath('../'))
 
+from zedenv import __version__
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
@@ -55,9 +55,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.1.0'
+version = __version__
 # The full version, including alpha/beta/rc tags.
-release = '0.1.0'
+release = f"{__version__}-alpha"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.