Error with relocatability

Hello,

we have embedded PlotlyLight into a compiled Julia application but it is facing some weird relocatability issues.

```julia
SystemError: opening file "/root/.julia/artifacts/aa67a2d0c294419c5568a236d0fdf8de18af2bd6/templates/plotly_white.json": No such file or directory
Stacktrace:
[1] systemerror(?::String, ?::Int32; ?::Nothing)
@ Base ./:0
[2] open(?::String; ?::Bool, ?::Nothing, ?::Nothing, ?::Nothing, ?::Nothing, ?::Nothing)
@ Base ./:0
[3] open(?::Base.var"#470#471"{Tuple{}}, ?::String; ?::@Kwargs{})
@ Base ./:0
[4] template!(?::String)
@ PlotlyLight ~/.julia/packages/PlotlyLight/DpYsf/src/PlotlyLight.jl:168
[5] _set_plot_defaults
@ /model_build/IARA.jl/src/plots/plots.jl:105 [inlined]
[6] initialize
@ /model_build/IARA.jl/src/IARA.jl:44 [inlined]
[7] main(?::IARA.Args)
@ IARA.InterfaceCalls /model_build/IARA.jl/src/interface_calls/main.jl:23
[8] main
@ /model_build/IARA.jl/src/interface_calls/main.jl:18 [inlined]
[9] julia_interface_call()
@ IARA /model_build/IARA.jl/src/main.jl:59
[10] top-level scope
@ none:1root@3efb74253c79:/IARA#
```
The path `/.root/.julia./...` comes from the machine where the application was compiled.

Although through investigation it seems that everything is relocatable I am afraid that the definition of `plotly::PlotlyArtifacts = PlotlyArtifacts()` in the main file of the module gets compiled at that moment of compilation and gets saved in the system image.

Is it possible to check or modify this in runtime?

Start at PlotlyLight.jl:168, where template! opens the artifact file, and inspect the PlotlyArtifacts initialization mentioned in the issue. Reproduce the failure in a compiled application relocated from the build machine, then trace _set_plot_defaults in plots.jl:105. Done means the runtime can locate templates without the compiler machine's absolute path.

Written by the indexing model from the issue text.