Issue 1127 extra notebooks

[rtimms]

Description

• Adds getting started notebooks for solver options and changing the mesh
• Adds a notebook on thermal options
• Adds a notebook on using the simulation class vs setting parameters, mesh, etc. manually
• Changes most examples to use the simulation class. This makes most examples shorter/simpler and encourages use of the simulation class as the preferred way of doing things. Note: I've left the SPM and DFN notebooks as they were (the "long way") as the SPM notebook gives lots of detailed information about each of the stages of processing, solving, etc., and we link to the DFN notebook in the readme saying more customization is available, so I think it makes sense to outline the different points at which you could customise. Both of these now point to the the simulation notebook

Fixes some of #1127

Leaving #1127 open as I still think we should add details of the DFN in dimensional form and add a table or similar giving the string names for the parameters (at least for the basic DFN).

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #1131 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1131   +/-   ##
========================================
  Coverage    97.92%   97.92%           
========================================
  Files          247      247           
  Lines        13910    13911    +1     
========================================
+ Hits         13622    13623    +1     
  Misses         288      288           

Impacted Files	Coverage Δ
...m/models/full_battery_models/base_battery_model.py	99.66% <ø> (ø)
...l_battery_models/lead_acid/base_lead_acid_model.py	100.00% <100.00%> (ø)
...ttery_models/lithium_ion/base_lithium_ion_model.py	100.00% <100.00%> (ø)
pybamm/simulation.py	96.81% <100.00%> (+0.01%)	⬆️

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[brosaplanella]

Just two minor comments but looks good to me. Thanks Rob!

[brosaplanella]

Are we using Binder? I removed it because I thought we weren't but happy to keep it.

[rtimms]

I've removed it. I think the link still works, but Colab is better

[brosaplanella]

At the end we didn't show how to do a graphical convergence study so we should change this sentence.

[rtimms]

thanks, I've updated this