Finally finished theme switching!!!!

src/api.py

@@ -181,4 +181,14 @@ class manageConfiguration:
                     return ret(status=False, reason="No [Interface] in configuration file")
                 return ret(data=dict(conf['Interface']))
         except FileNotFoundError as err:
-            return ret(status=False, reason=str(err))
+            return ret(status=False, reason=str(err))
+
+
+class settings:
+    def setTheme(self, theme, config, setConfig):
+        themes = ['light', 'dark']
+        if theme not in themes: 
+            return ret(status=False, reason="Theme does not exist")
+        config['Server']['dashboard_theme'] = theme
+        setConfig(config)
+        return ret()