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/engine/procedures/priming.h

@@ -2,12 +2,12 @@
 
 #include "gridfire/engine/engine_abstract.h"
 #include "gridfire/engine/engine_graph.h"
-#include "gridfire/network.h"
+#include "gridfire/types/types.h"
 
 #include "fourdst/atomic/atomicSpecies.h"
 
 
-namespace gridfire {
+namespace gridfire::engine {
 
     /**
      * @brief Primes absent species in the network to their equilibrium abundances.