Fix BLR tutorial

[AuguB]

Hi @contsili, and also @CharFraza because I realise this could be related to the issues you are describing.

The reason that the BLR plots look different from before is that the new version of the example has the BLR model configured with:

    fixed_effect_slope=True,  # We also model a fixed effect in the slope of the mean for each individual batch effect
    fixed_effect_var_slope=True,

If these are both set to false, the plots are similar as before.

With both true:

With both false:

[contsili]

Perfect thanks! Also, Why the gray points don't show well in the legend? I think it is supposed to say "Other data" in the legend for these points

[contsili]

And note for @CharFraza: we noticed that the examples in the examples/ folder in github are not exactly the same as the ones on the website. So keep that in mind because I know you are using the examples from github.

I will make sure from now on they are in sync (github and website)

[contsili]

TODO: find a way to always sync what is in the website and what is in the repo (eg., add an action)