add links to other files

material/5_fri/optimizing_julia/optimizing_julia.md

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 # Optimizing Julia code
 
 This session provides an introduction to optimizing Julia code.
-The examples are developed with Julia v1.9.3.
+The examples are developed with Julia v1.9.3. You can download
+all files from the summer school website:
+
+- [`optimizing_julia.jl`](optimizing_julia.jl)
+- [`Project.toml`](Project.toml)
+- [`Manifest.toml`](Manifest.toml)
+
+This website renders the content of 
+[`optimizing_julia.jl`](optimizing_julia.jl).
 
 First, we install all required packages