Merge pull request #60 from gamma-opt/figure-fix

Update syntax for figures

Author: solliolli

docs/src/decision-programming/RJT-model.md

@@ -18,9 +18,9 @@ A rooted tree satisfying condition (1) is said to satisfy the *running intersect
 
 An example of influence diagram (upper figure) conversion to RJT (lower figure) for [pig breeding](@ref pig-breeding) problem with $N=4$ is shown below.
 
-<img src="figures/pig_breeding_N=4.jpg" width="400"> <br>
+![](figures/pig_breeding_N=4.jpg)
 
-<img src="figures/pig_breeding_rjt_N=4.jpg" width="330">
+![](figures/pig_breeding_rjt_N=4.jpg)
 
 ## Formulating an optimization problem based on gradual RJT
 
@@ -103,4 +103,4 @@ Currently, the RJT formulation commands in the package do not support forbidden
 
 [^2]: Parmentier, A., Cohen, V., Leclere, V., Obozinski, G., Salmon, J., 2020. Integer programming on the junction tree polytope for influence diagrams. INFORMS Journal on Optimization 2, 209–228.
 
-[^3]: Koller, D., Friedman, N., 2009. Probabilistic graphical models: principles and techniques. MIT press
+[^3]: Koller, D., Friedman, N., 2009. Probabilistic graphical models: principles and techniques. MIT press