Remove latex manual

[gassmoeller]

Remove the outdated latex manual in favor of the new Sphinx documentation. Almost no references to the old manual were left and I removed the last ones I could find.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3bb11ca) 93.37% compared to head (5ea7d3b) 93.37%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #595   +/-   ##
=======================================
  Coverage   93.37%   93.37%           
=======================================
  Files          92       92           
  Lines        6266     6266           
=======================================
  Hits         5851     5851           
  Misses        415      415           

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	0.965 ± 0.004 (s=473)	0.965 ± 0.004 (s=462)	-0.1% .. +0.1%
Slab interpolation curved simple none	0.964 ± 0.011 (s=465)	0.964 ± 0.010 (s=471)	-0.2% .. +0.3%
Spherical slab interpolation simple none	1.069 ± 0.006 (s=441)	1.069 ± 0.005 (s=403)	-0.2% .. +0.0%
Slab interpolation simple curved CMS	1.013 ± 0.005 (s=435)	1.012 ± 0.004 (s=456)	-0.1% .. +0.0%
Spherical slab interpolation simple CMS	1.328 ± 0.007 (s=356)	1.327 ± 0.006 (s=324)	-0.2% .. +0.1%
Spherical fault interpolation simple none	1.073 ± 0.005 (s=406)	1.074 ± 0.006 (s=435)	-0.1% .. +0.2%
Cartesian min max surface	2.183 ± 0.021 (s=205)	2.182 ± 0.021 (s=210)	-0.4% .. +0.3%
Spherical min max surface	6.928 ± 0.029 (s=70)	6.926 ± 0.022 (s=62)	-0.2% .. +0.2%

[MFraters]

Thanks for removing this. Can you also remove the target for in the CMakeLists.txt and rename the manual_html to just manual?

[MFraters]

Sorry, I was confused about what the manual pdf target did. This is good to merge.