[Doc] Plot manual

[ocots]

• Update plot manual when the compat of CTModels is up-to-date, since the method plot(sol, ocp) won't exist anymore.
• We must add also the docstrings of the plot(sol, description...; kwargs...) method with an overview of the possibilities and a table of content. Give the default values of the keyword arguments.
• Add the lists of attributes of Plots in a "details":

https://github.com/control-toolbox/OptimalControl.jl/blob/ea1e64bc9b55dbcd68bf43ac176679c30f3b9421/docs/src/index.md?plain=1#L105-L115

• Update plot for the LQR example, following https://control-toolbox.org/Tutorials.jl/stable/tutorial-lqr.html.