refactor(bar): move widgets to new folder

This commit moves all the widgets to a new folder in order to organize
the code while hoping to make it easier to find and add a widget.

komorebi-bar/src/widgets/mod.rs

@@ -0,0 +1,13 @@
+pub mod battery;
+pub mod cpu;
+pub mod date;
+pub mod keyboard;
+pub mod komorebi;
+mod komorebi_layout;
+pub mod media;
+pub mod memory;
+pub mod network;
+pub mod storage;
+pub mod time;
+pub mod update;
+pub mod widget;