libs/module: Rename imu.py to attitude_estimator.py for clarity.

Signed-off-by: hlym123 <[email protected]>

Author: hlym123

docs/en/module/bala2.rst

@@ -9,6 +9,8 @@ The Bala2 Module is part of the M5Stack stackable module series. The module comm
 
 Support the following products:
 
+    |Bala2|
+
     |Bala2-Fire|
 
 

docs/en/refs/module.bala2.ref

@@ -1,3 +1,7 @@
+.. |Bala2| image:: https://static-cdn.m5stack.com/resource/docs/products/app/bala2/bala2_01.webp
+    :target: https://docs.m5stack.com/en/app/bala2
+    :height: 200px
+    :width: 200px
 
 .. |Bala2-Fire| image:: https://static-cdn.m5stack.com/resource/docs/products/app/bala2fire/bala2_01.webp
     :target: https://docs.m5stack.com/en/app/bala2fire