Re-structure documentation navigation (maintain old links)

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6423 (0d7046c) into master (20bc0b3) will decrease coverage by 1.81%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6423      +/-   ##
==========================================
- Coverage   86.51%   84.69%   -1.82%     
==========================================
  Files         395      395              
  Lines       21692    21655      -37     
==========================================
- Hits        18766    18340     -426     
- Misses       2926     3315     +389     

Impacted Files	Coverage Δ
torch_geometric/data/data.py	88.79% <ø> (ø)
torch_geometric/data/dataset.py	91.77% <ø> (ø)
torch_geometric/data/in_memory_dataset.py	86.84% <ø> (ø)
torch_geometric/nn/conv/message_passing.py	98.91% <ø> (ø)
torch_geometric/nn/models/dimenet_utils.py	0.00% <0.00%> (-75.52%)	⬇️
torch_geometric/nn/models/dimenet.py	17.84% <0.00%> (-49.66%)	⬇️
torch_geometric/visualization/graph.py	68.25% <0.00%> (-26.99%)	⬇️
torch_geometric/profile/profile.py	33.33% <0.00%> (-25.39%)	⬇️
torch_geometric/nn/conv/utils/typing.py	83.75% <0.00%> (-15.00%)	⬇️
torch_geometric/nn/pool/asap.py	92.00% <0.00%> (-8.00%)	⬇️
... and 34 more

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