chore(config): 🎨 restructure lazygit theme configuration

Move theme settings under `gui` section to match latest lazygit
configuration format. This aligns with the updated configuration
structure introduced in recent versions.

The color values remain unchanged - only the nesting structure has been
modified to maintain compatibility with lazygit's configuration schema
requirements.

home/.config/lazygit/config.yml

@@ -1,23 +1,24 @@
-theme:
-  activeBorderColor:
-    - '#8bd5ca'
-    - bold
-  inactiveBorderColor:
-    - '#a5adcb'
-  optionsTextColor:
-    - '#8aadf4'
-  selectedLineBgColor:
-    - '#363a4f'
-  cherryPickedCommitBgColor:
-    - '#494d64'
-  cherryPickedCommitFgColor:
-    - '#8bd5ca'
-  unstagedChangesColor:
-    - '#ed8796'
-  defaultFgColor:
-    - '#cad3f5'
-  searchingActiveBorderColor:
-    - '#eed49f'
+gui:
+  theme:
+    activeBorderColor:
+      - '#8bd5ca'
+      - bold
+    inactiveBorderColor:
+      - '#a5adcb'
+    optionsTextColor:
+      - '#8aadf4'
+    selectedLineBgColor:
+      - '#363a4f'
+    cherryPickedCommitBgColor:
+      - '#494d64'
+    cherryPickedCommitFgColor:
+      - '#8bd5ca'
+    unstagedChangesColor:
+      - '#ed8796'
+    defaultFgColor:
+      - '#cad3f5'
+    searchingActiveBorderColor:
+      - '#eed49f'
 
-authorColors:
-  '*': '#b7bdf8'
+  authorColors:
+    '*': '#b7bdf8'