Fix menu structure for tutorials

Author: AleMorales

docs/make.jl

@@ -13,7 +13,8 @@ makedocs(;
         edit_link="master",
         assets=String[],
         collapselevel = 1,
-        footer = nothing
+        footer = nothing,
+        size_threshold = nothing
     ),
     pages=[
         "Virtual Plant Laboratory" => "index.md",
@@ -25,7 +26,7 @@ makedocs(;
             "Ray tracing" => "manual/Raytracer.md",
             "3D visualization" => "manual/Visualization.md"
         ],
-        "Tutorials" => "tutorials/intro_tut.md",[
+        "Tutorials" => ["Intro" => "tutorials/intro_tut.md",
             "Getting started with VPL" =>
             ["Algae growth" => "tutorials/getting_started/algae.md",
             "The Koch snowflake" => "tutorials/getting_started/snowflakes.md"],

docs/src/tutorials/getting_started/algae.md

@@ -125,7 +125,7 @@ graph, but different options are available depending on the context where the
 code is executed. By default, `draw()` will create a new window where an
 interactive version of the graph will be drawn and one can zoom and pan with the
 mouse (in this online document a static version is shown, see
-[Backends](../manual/Visualization.md) for details):
+[Backends](../../manual/Visualization.md) for details):
 
 ````julia
 import GLMakie
@@ -159,4 +159,3 @@ handy when graphs become large.
 ---
 
 *This page was generated using [Literate.jl](https://github.com/fredrikekre/Literate.jl).*
-