Move nn.models to individual sub-pages in documentation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6693 (1ce030d) into master (ae6924f) will decrease coverage by 1.58%.
The diff coverage is 100.00%.

❗ Current head 1ce030d differs from pull request most recent head 162e6aa. Consider uploading reports for the commit 162e6aa to get more accurate results

@@            Coverage Diff             @@
##           master    #6693      +/-   ##
==========================================
- Coverage   90.55%   88.97%   -1.58%     
==========================================
  Files         423      423              
  Lines       22992    22955      -37     
==========================================
- Hits        20820    20424     -396     
- Misses       2172     2531     +359     

Impacted Files	Coverage Δ
torch_geometric/nn/models/autoencoder.py	100.00% <ø> (ø)
torch_geometric/nn/models/basic_gnn.py	89.26% <ø> (-1.70%)	⬇️
torch_geometric/nn/models/correct_and_smooth.py	100.00% <ø> (ø)
torch_geometric/nn/models/deep_graph_infomax.py	100.00% <ø> (ø)
torch_geometric/nn/models/deepgcn.py	93.75% <ø> (ø)
torch_geometric/nn/models/dimenet.py	17.66% <ø> (-49.78%)	⬇️
torch_geometric/nn/models/gnnff.py	100.00% <ø> (ø)
torch_geometric/nn/models/jumping_knowledge.py	100.00% <ø> (ø)
torch_geometric/nn/models/label_prop.py	100.00% <ø> (ø)
torch_geometric/nn/models/lightgcn.py	96.15% <ø> (ø)
... and 50 more

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