Use newest Documenter for docs

[mortenpi]

• Fix Documenter to https://github.com/JuliaDocs/Documenter.jl/commit/9a518379edf7fd9c9cf7932ad20ef6fe8b40c495 in the manifest.
• Fix the logo (no white background, and white text logo for the dark theme)

There are also a few docstrings that are not included in the manual right now:

┌ Warning: 6 docstrings not included in the manual:
│ 
│     EnergyExpressions.coupled_states :: Tuple{SparseArrays.AbstractSparseMatrix{Tv, Ti} where {Tv, Ti}}
│     LinearAlgebra.ishermitian :: Tuple{QuantumOperator}
│     EnergyExpressions.non_zero_cofactors :: Tuple{BitConfigurations, Any, Any, Any}
│     Base.isapprox :: Tuple{EnergyExpressions.NBodyMatrixElement, EnergyExpressions.NBodyMatrixElement}
│     EnergyExpressions.compare :: Tuple{EnergyExpressions.NBodyMatrixElement, Any, EnergyExpressions.NBodyMatrixElement}
│     Base.:== :: Tuple{EnergyExpressions.NBodyMatrixElement, EnergyExpressions.NBodyMatrixElement}
│ 
│ These are docstrings in the checked modules (configured with the modules keyword)
│ that are not included in @docs or @autodocs blocks.
└ @ Documenter.DocChecks ~/.julia/packages/Documenter/Eieg5/src/Utilities/Utilities.jl:41

[codecov[bot]]

Codecov Report

Merging #15 (ec2ec58) into master (49eb810) will increase coverage by 0.43%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   23.01%   23.45%   +0.43%     
==========================================
  Files          14       14              
  Lines         808      857      +49     
==========================================
+ Hits          186      201      +15     
- Misses        622      656      +34     

Impacted Files	Coverage Δ
src/slater_determinants.jl	11.11% <0.00%> (-0.89%)	:arrow_down:
src/nbody_operators.jl	5.76% <0.00%> (-0.24%)	:arrow_down:
src/minors.jl	100.00% <0.00%> (ø)
src/variations.jl	0.00% <0.00%> (ø)
src/invariant_sets.jl	0.00% <0.00%> (ø)
src/multi_configurational_equations.jl	0.00% <0.00%> (ø)
src/bit_configurations.jl	4.11% <0.00%> (+0.18%)	:arrow_up:
src/nbody_matrix_elements.jl	40.00% <0.00%> (+0.68%)	:arrow_up:
src/conjugate_orbitals.jl	71.42% <0.00%> (+4.76%)	:arrow_up:

---

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[mortenpi]

:tada: http://juliaatoms.org/EnergyExpressions.jl/previews/PR15/

[jagot]

Thanks!