Refactor project structure and remove unnecessary files

- Deleted generated CMake files and build artifacts from the cmake-build-debug directory.
- Removed the Intellisense header - what was that???
- Cleaned up the melonDS.ini configuration (removed hard path)

.clangd

@@ -0,0 +1,18 @@
+CompileFlags:
+  # GCC-only/obsolete for clang; keeps clangd diagnostics clean on devkitARM commands.
+  Compiler: /opt/devkitpro/devkitARM/bin/arm-none-eabi-g++
+  Remove:
+    - -mthumb-interwork
+  Add:
+    - -isystem
+    - /opt/devkitpro/devkitARM/arm-none-eabi/include/c++/15.2.0
+    - -isystem
+    - /opt/devkitpro/devkitARM/arm-none-eabi/include/c++/15.2.0/arm-none-eabi
+    - -isystem
+    - /opt/devkitpro/devkitARM/arm-none-eabi/include/c++/15.2.0/backward
+    - -isystem
+    - /opt/devkitpro/devkitARM/lib/gcc/arm-none-eabi/15.2.0/include
+    - -isystem
+    - /opt/devkitpro/devkitARM/lib/gcc/arm-none-eabi/15.2.0/include-fixed
+    - -isystem
+    - /opt/devkitpro/devkitARM/arm-none-eabi/include