Revise CHANGELOG for version 2.0 updates

Updated the changelog to reflect new features, general improvements, user interface changes, and application code enhancements.

Author: quen0n

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Unitemp changelog
 ## Unitemp 2.0
-#### New Features and Sensors
+New Features and Sensors
 - Added LED, sound, and vibration indication of the environment's status. The RGB LED will show the safety level of the thermal index and CO2 concentration in the air. Green means safe, yellow means remove active loads and ventilate the room. Red means the environment is hazardous to health. Flashing red and audible and vibration alarms indicate a fatal health hazard.
 - Added scanning for devices connected to the I2C bus when creating or editing a sensor. This will make it easy to find the required address and prevent creating sensors with duplicate addresses.
 - Added the ability to connect Dallas sensors (DS18B20, etc.) to port 17 (1W).
@@ -10,18 +10,21 @@
 - Added 5V power management setting.
 - Added support for the HDC2080 sensor.
 - Added support for the SHT40/41/45 sensors.
-#### General
+
+General
 - Sensor configuration and save files have been moved to apps_data. Saved sensors from the previous version of the app will automatically migrate to the new location.
 - Fixed temperature index calculation. It is now only calculated for temperatures above 21°C (70°F).
 - Temporarily removed SCD40/41 calibration
 - Updated the list of sensors in the README.
-#### User Interface
+
+User Interface
 - Improved display of CO2 concentration values ​​in the air.
 - The backlight is always on only when sensor values ​​are displayed. In the menu, the backlight will be turned off according to the system settings.
 - Added a wait state for sensor values. If a sensor is initialized but its values ​​are not yet ready, the message "Reading values..." is displayed. - The "No sensors found" message has been replaced with "No sensors yet."
 - The crying dolphin icon has been replaced with a confused one (whatever that means).
 - New windows and other GUI improvements.
-#### Application Code
+
+Application Code
 - General code quality improvements. The GUI has been completely rewritten using native libraries.
 - Memory leaks have been fixed.
 - Sensor polling and screen rendering are now performed asynchronously in separate threads.