Updated TagPOMDP gallery example to use PGFPlotsX

docs/src/gallery.md

@@ -229,7 +229,15 @@ The orange agent is the pursuer and the red agent is the evader. The pursuer mus
 
 ![TagPOMDPProblem](examples/TagPOMDP.gif)
 
-```julia
+```@setup TagPOMDP
+using Pkg
+Pkg.add("Plots")
+Pkg.add("PGFPlotsX")
+using Plots
+pgfplotsx()
+```
+
+```@example TagPOMDP
 using POMDPs
 using TagPOMDPProblem
 using NativeSARSOP
@@ -245,6 +253,12 @@ saved_gif = simulate(sim, pomdp, policy)
 println("gif saved to: $(saved_gif.filename)")
 ```
 
+```@setup TagPOMDP
+using Pkg
+Pkg.rm("Plots")
+Pkg.rm("PGFPlotsX")
+```
+
 !!! note
     This gif was **not** generated at documentation build time because of GR errors with Github Actions ([Plots.jl issue 4764](https://github.com/JuliaPlots/Plots.jl/issues/4764)).