docs: finish env variables

Author: softwareentrepreneer

.env.example

@@ -1,2 +1,2 @@
-AP_AUTO_SYNC=0        # if = 1, Auto-sync pyproject.toml+afterpython.toml-> myst.yml files
-AP_MOLAB_BADGE=1      # if = 1, auto-add molab badges to jupyter notebooks
+AP_AUTO_SYNC=0        # if = 1, Auto-sync pyproject.toml+afterpython.toml-> authors.yml+myst.yml files
+AP_MOLAB_BADGE=1      # if = 1, Auto-add molab badges to jupyter notebooks

afterpython/doc/references/environment_variables.md

@@ -1,10 +1,8 @@
----
-authors:
-- new_author_id_defined_in_authors_yml
----
-
 # Environment Variables
 
 ## `AP_AUTO_SYNC`
+> Default: `0`. If set to `1`, automatically syncs configuration from `pyproject.toml` and `afterpython.toml` to `authors.yml` and `myst.yml` files.
 
+---
 ## `AP_MOLAB_BADGE`
+> Default: `0`. If set to `1`, automatically adds Molab badges to Jupyter notebooks.