LieAlgebras: Add section with Dynkin diagrams to docs

[lgoettgens]

preview: https://docs.oscar-system.org/previews/PR4390/Experimental/LieAlgebras/cartan_matrix/

The bib-entry for the Bourbaki is still missing (ping @felix-roehrich).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.38%. Comparing base (75dd78a) to head (6627fb6).
Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4390   +/-   ##
=======================================
  Coverage   84.38%   84.38%           
=======================================
  Files         656      656           
  Lines       87201    87198    -3     
=======================================
- Hits        73583    73582    -1     
+ Misses      13618    13616    -2     

Files with missing lines	Coverage Δ
experimental/LieAlgebras/src/CartanMatrix.jl	97.57% <ø> (ø)
experimental/LieAlgebras/src/DynkinDiagram.jl	100.00% <100.00%> (ø)

... and 15 files with indirect coverage changes

[fingolfin]

Entry from mathScinet, including a DOI:

@book {MR1890629,
    AUTHOR = {Bourbaki, Nicolas},
     TITLE = {Lie groups and {L}ie algebras. {C}hapters 4--6},
    SERIES = {Elements of Mathematics (Berlin)},
      NOTE = {Translated from the 1968 French original by Andrew Pressley},
 PUBLISHER = {Springer-Verlag, Berlin},
      YEAR = {2002},
     PAGES = {xii+300},
      ISBN = {3-540-42650-7},
   MRCLASS = {17-01 (00A05 20E42 20F55 22-01)},
  MRNUMBER = {1890629},
       DOI = {10.1007/978-3-540-89394-3},
       URL = {https://doi.org/10.1007/978-3-540-89394-3},
}

[lgoettgens]

The doi unfortunately results in a soft 404 (which somewhat goes against the idea of dois....)

The entry was taken from springer's webpage

[lgoettgens]

Suggested change

	@Book{Bou02,
	author = {Bourbaki, Nicolas},
	title = {Lie Groups and Lie Algebras: Chapters 4--6},
	series = {Elements of Mathematics},
	note = {Original French edition published with the title: Éléments de Matematique, Groupes et Algèbres de
	Lie 4, 5, e 6, 1968. Translated by Pressley},
	publisher = {Springer},
	year = {2002}
	}
	@Book{Bou02,
	author = {Bourbaki, Nicolas},
	title = {Lie groups and Lie algebras. Chapters 4--6},
	series = {Elements of Mathematics (Berlin)},
	note = {Translated from the 1968 French original by Andrew Pressley},
	publisher = {Springer-Verlag, Berlin},
	year = {2002},
	doi = {10.1007/978-3-540-89394-3}
	}

This is the mathscinet version after applying bibtool. If you like this better feel free to apply this change and proceed with merging @fingolfin. I don't care enough to block this PR over it.

[lgoettgens]

gentle bump @fingolfin