Change license, add Makefile, add image caching control

1 files changed, 4 insertions, 2 deletions

diff --git a/source/know/concept/step-index-fiber/index.md b/source/know/concept/step-index-fiber/index.md
index 210a339..2d049a1 100644
--- a/source/know/concept/step-index-fiber/index.md
+++ b/source/know/concept/step-index-fiber/index.md
@@ -269,7 +269,8 @@ $$\begin{aligned}
     \end{cases}
 \end{aligned}$$
 
-{% include image.html file="bessel-full.png" width="100%" alt="First few solutions to Bessel's equation" %}
+{% include image.html file="bessel-full.png" width="100%"
+    alt="First few solutions to Bessel's equation" %}
 
 Looking at these solutions with our constraints for $$R_o$$ in mind,
 we see that for $$\mu > 0$$ none of the solutions decay
@@ -429,7 +430,8 @@ An example graphical solution of the transcendental equation
 is illustrated below for a fiber with $$V = 5$$,
 where red and blue respectively denote the left and right-hand side:
 
-{% include image.html file="transcendental-full.png" width="100%" alt="Graphical solution of transcendental equation" %}
+{% include image.html file="transcendental-full.png" version="2" width="100%"
+    alt="Graphical solution of transcendental equation" %}
 
 For the ground state the light is well-confined in the core,
 but for higher modes it increasingly leaks into the cladding,