Minor Improvements & Updated Flutter section

Chapter2/Chapter2.typ

@@ -1,6 +1,10 @@
 #import "../PageTemplate.typ": page-theme
+#import "@preview/i-figured:0.2.4"
 #show: page-theme
 
+#show heading: i-figured.reset-counters.with(level: 3)
+#show figure: i-figured.show-figure.with(level: 3)
+
 = บทที่ 2 \ ทฤษฎีและเอกสารที่เกี่ยวข้อง
 
 #include "Intro.typ"
@@ -12,4 +16,5 @@
 #include "NFC.typ"
 #include "PIR.typ"
 #include "CLanguage.typ"
-#include "AppDev.typ"
+#include "Flutter.typ"
+#include "Git.typ"