docs: remove broken Discord invite

[TestingPlant]

This Discord server no longer exists.

[github-actions]

Benchmark Results for general

ray_intersection/aabb_size_0.1                     [  33.3 ns ...  33.2 ns ]      -0.02%
ray_intersection/aabb_size_1                       [  33.0 ns ...  32.9 ns ]      -0.11%
ray_intersection/aabb_size_10                      [  23.8 ns ...  23.9 ns ]      +0.31%
ray_intersection/ray_distance_1                    [  13.8 ns ...  13.7 ns ]      -0.18%
ray_intersection/ray_distance_5                    [  13.8 ns ...  13.8 ns ]      +0.12%
ray_intersection/ray_distance_20                   [  13.8 ns ...  13.8 ns ]      -0.21%
overlap/no_overlap                                 [  25.1 ns ...  25.1 ns ]      +0.18%
overlap/partial_overlap                            [  25.2 ns ...  25.1 ns ]      -0.32%
overlap/full_containment                           [  22.5 ns ...  22.5 ns ]      -0.05%
point_containment/inside                           [   4.9 ns ...   4.9 ns ]      +0.02%
point_containment/outside                          [   4.4 ns ...   4.4 ns ]      -0.17%
point_containment/boundary                         [   5.0 ns ...   5.0 ns ]      -0.08%

Comparing to 188a3e4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 20.84%. Comparing base (188a3e4) to head (49289c5).

@@           Coverage Diff           @@
##             main     #902   +/-   ##
=======================================
  Coverage   20.84%   20.84%           
=======================================
  Files         161      161           
  Lines       16864    16864           
  Branches      464      464           
=======================================
  Hits         3516     3516           
  Misses      13284    13284           
  Partials       64       64           

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