rename mag_tag to magtag. fix docs build for new name

Author: FoamyGuy

adafruit_pybadger/__init__.py

@@ -21,4 +21,4 @@
 elif "Circuit Playground Bluefruit" in os.uname().machine:
     from .cpb_gizmo import cpb_gizmo as pybadger
 elif "MagTag with ESP32S2" in os.uname().machine:
-    from .magtag import mag_tag as pybadger
+    from .magtag import magtag as pybadger

adafruit_pybadger/magtag.py

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: MIT
 
 """
-`adafruit_pybadger.mag_tag`
+`adafruit_pybadger.magtag`
 ================================================================================
 
 Badge-focused CircuitPython helper library for Mag Tag.
@@ -80,5 +80,5 @@ def _unsupported(self):
     button = _unsupported
 
 
-mag_tag = MagTag()  # pylint: disable=invalid-name
+magtag = MagTag()  # pylint: disable=invalid-name
 """Object that is automatically created on import."""

docs/api.rst

@@ -10,7 +10,7 @@
 .. automodule:: adafruit_pybadger.clue
    :members:
 
-.. automodule:: adafruit_pybadger.mag_tag
+.. automodule:: adafruit_pybadger.magtag
    :members:
 
 .. automodule:: adafruit_pybadger.pewpewm4