Update for Manifolds.jl 0.9 and Documenter.jl 1.0

[mateuszbaran]

Also introduces DocumenterCitations.jl

[codecov]

Codecov Report

Merging #24 (99d7dcb) into main (d20bc93) will increase coverage by 3.43%.
The diff coverage is 100.00%.

❗ Current head 99d7dcb differs from pull request most recent head a759c11. Consider uploading reports for the commit a759c11 to get more accurate results

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   91.69%   95.12%   +3.43%     
==========================================
  Files           8        8              
  Lines         337      328       -9     
==========================================
+ Hits          309      312       +3     
+ Misses         28       16      -12     

Files	Coverage Δ
src/error_estimation.jl	100.00% <100.00%> (+37.50%)	⬆️
src/frozen_solvers.jl	100.00% <ø> (ø)
src/lie_solvers.jl	100.00% <ø> (ø)
src/problems.jl	66.66% <ø> (ø)
src/utils.jl	0.00% <ø> (ø)

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