Tutorial- og Layout update

[mEngstroem]

Updated tutorials, restructured index to EasyDiffraction-layout, moved dictionary and calculator into 'tutorials.rst'

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[elindgren]

Finished first part of my review, will take a look at the notebooks next. As an "outsider", I think the overall changes makes sense. I just had a few nitpicks/questions.

[elindgren]

I had a look at the notebooks, and I see that most of them have been migrated as-is. Looks good to me!

Another point of feedback I had could maybe be to rename the "Usage" tab to "Getting started", and include a minimum example usage of the package (beyond importing it) if possible. Maybe something like

import easyreflectometry
from easyreflectometry.sample import Material, Layer
from easyreflectometry.model import Model
from easyreflectometry.fitting import MultiFitter
from easyreflectometry.plot import plot

# Define your Material
material = Material(...)

# Create a Layer
layer = Layer(material=material, ...)

# Make a Sample out of the Layer
sample = Sample(layer, ...)

# Define a Model of the experiment
model = Model(
    sample=sample,
    scale=1,
    background=1e-6,
    ...
)

# Set parameter bounds for fit
...

# Perform the fit and plot
fitter = MultiFitter(model)
analysed = fitter.fit(data)

plot(analysed)

Show the end user that it's really easy using EasyReflectometry! 🌈

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[henrikjacobsenfys]

I removed output from the Jupyter notebooks. I think it's ready for merging, I can do that tomorrow.