docs(ridfire)

Added more documentation, also moved all engine code into
gridfire::engine namespace to be more in line with other parts of teh
code base

src/include/gridfire/exceptions/error_gridfire.h

@@ -4,6 +4,12 @@
 #include <string>
 
 namespace gridfire::exceptions {
+    /**
+     * @brief Base class for GridFire exceptions.
+     *
+     * This class serves as the base for all exceptions specific to the GridFire library.
+     * It extends the standard std::exception class and allows for custom error messages.
+     */
     class GridFireError : public std::exception {
     public:
         explicit GridFireError(std::string msg) : m_msg(std::move(msg)) {}