Merge branch 'dev' into 'dev.v4'

Author: hollasch

books/RayTracingInOneWeekend.html

@@ -39,6 +39,9 @@
 
 I hope that you find the math as fascinating as I do.
 
+See the [project README][readme] file for information about this project, the repository on GitHub,
+directory structure, building & running, and how to make or reference corrections and contributions.
+
 As before, see [our Further Reading wiki page][wiki-further] for additional project related
 resources.
 
@@ -260,7 +263,6 @@
     #include "rtweekend.h"
 
     #include "camera.h"
-    #include "color.h"
     #include "hittable_list.h"
     #include "material.h"
     #include "quad.h"
@@ -3923,6 +3925,7 @@
 [Steve Hollasch]:     https://github.com/hollasch
 [Trevor David Black]: https://github.com/trevordblack
 
+[readme]:             ../README.md
 [releases]:           https://github.com/RayTracing/raytracing.github.io/releases/
 [wiki-further]:       https://github.com/RayTracing/raytracing.github.io/wiki/Further-Readings
 

books/RayTracingTheNextWeek.html

@@ -11,10 +11,6 @@
 // along with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
 //==============================================================================================
 
-#include "vec3.h"
-
-#include <iostream>
-
 using color = vec3;
 
 inline double linear_to_gamma(double linear_component)