Change license, add Makefile, add image caching control

1 files changed, 8 insertions, 4 deletions

diff --git a/source/know/concept/random-phase-approximation/index.md b/source/know/concept/random-phase-approximation/index.md
index 0d0b428..03fd302 100644
--- a/source/know/concept/random-phase-approximation/index.md
+++ b/source/know/concept/random-phase-approximation/index.md
@@ -71,17 +71,20 @@ leaving only the single most divergent one at each order $$n$$,
 i.e. the ones where all $$n$$ interaction lines
 carry the same momentum and energy:
 
-{% include image.html file="self-energy.png" width="92%" alt="RPA self-energy definition" %}
+{% include image.html file="self-energy.png" width="92%"
+    alt="RPA self-energy definition" %}
 
 Where we have defined the **screened interaction** $$W^\mathrm{RPA}$$,
 denoted by a double wavy line:
 
-{% include image.html file="interaction.png" width="95%" alt="RPA screened interaction definition" %}
+{% include image.html file="interaction.png" width="95%"
+    alt="RPA screened interaction definition" %}
 
 Rearranging the above sequence of diagrams quickly leads to the following
 [Dyson equation](/know/concept/dyson-equation/):
 
-{% include image.html file="dyson.png" width="55%" alt="Dyson equation for screened interaction" %}
+{% include image.html file="dyson.png" width="55%"
+    alt="Dyson equation for screened interaction" %}
 
 In Fourier space, this equation's linear shape
 means it is algebraic, so we can write it out:
@@ -98,7 +101,8 @@ with an internal wavevector $$\vb{q}$$, fermionic frequency $$i \omega_m^F$$, an
 Abbreviating $$\tilde{\vb{k}} \equiv (\vb{k}, i \omega_n^B)$$
 and $$\tilde{\vb{q}} \equiv (\vb{q}, i \omega_n^F)$$:
 
-{% include image.html file="pairbubble.png" width="45%" alt="Internal variables of pair-bubble diagram" %}
+{% include image.html file="pairbubble.png" width="45%"
+    alt="Internal variables of pair-bubble diagram" %}
 
 We isolate the Dyson equation for $$W^\mathrm{RPA}$$,
 which reveals its physical interpretation as a *screened* interaction: