doc: update build instructions (#9)

Author: georgik

Apps.cmake

@@ -33,7 +33,7 @@ export SDKCONFIG_DEFAULTS=sdkconfig.defaults.m5stack_core_s3
 Finish the configuration (copy of proper idf_component.yml to main and all applications in apps directory):
 
 ```shell
-cmake -P SelectBoard.cmake
+cmake -Daction=select_board -P Bootloader.cmake
 ```
 
 ### Switching to other board
@@ -52,8 +52,7 @@ You should repeat this process also for applications.
 Build and flash all applications at once:
 
 ```shell
-idf.py flash
-cmake -S . -B build -P Apps.cmake
+cmake -Daction=build_all_apps -P Bootloader.cmake
 ```
 
 ## Build applications one by one

README.md

@@ -11,6 +11,9 @@
         "attrs": { "psramSize": "16", "flashSize": "16" }
       }
     ],
-    "connections": [ [ "$serialMonitor:RX", "esp32:G43", "", [] ], [ "$serialMonitor:TX", "esp32:G44", "", [] ] ],
+    "connections": [
+      [ "$serialMonitor:RX", "esp32:G44", "", [] ],
+      [ "$serialMonitor:TX", "esp32:G43", "", [] ]
+    ],
     "dependencies": {}
-}
+}