Various improvements (#21)

* T-Deck stability and naming improvements

* allow main task to clean itself up

* remove unused includes

* various lvgl improvements

* added docs

app-sim/src/main.c

@@ -1,16 +1,13 @@
 #include "hello_world/hello_world.h"
-#include "lvgl_hal.h"
 #include "tactility.h"
-#include "ui/lvgl_sync.h"
 
 #include "FreeRTOS.h"
-#include "task.h"
 
 #define TAG "main"
 
 extern HardwareConfig sim_hardware;
 
-_Noreturn void app_main() {
+void app_main() {
     static const Config config = {
         .hardware = &sim_hardware,
         .apps = {
@@ -20,11 +17,5 @@ _Noreturn void app_main() {
         .auto_start_app_id = NULL
     };
 
-    TT_LOG_I("app", "Hello, world!");
-
     tt_init(&config);
-
-    while (true) {
-        vTaskDelay(1000);
-    }
 }