chore: cleanup repository and add Gitea Actions build workflow

- Update .gitignore to exclude build artifacts and IDE files
- Remove tracked .idea and .vscode directories from index
- Add .gitea/workflows/build.yaml for CI
- Commit existing source changes and README updates

.gitignore

@@ -1,3 +1,24 @@
-.vscode
-cmake-build-debug
-build
+# CMake
+CMakeCache.txt
+CMakeFiles/
+CMakeLists.txt.user
+cmake_install.cmake
+install_manifest.txt
+Makefile
+cmake-build-debug/
+cmake-build-release/
+build/
+bin/
+
+# Executables
+ScreamIntoTheVoid
+
+# IDEs
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db