Docs/seo

[Borda]

What does this PR do?

fix canonical links in docs

Before submitting

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• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests? [not needed for typos/docs]
• Did you verify new and existing tests pass locally with your changes?
• If you made a notable change (that affects users), did you update the CHANGELOG?

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[codecov]

Codecov Report

Merging #190 (dcaf126) into master (03b8426) will decrease coverage by 6.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
- Coverage   87.03%   80.56%   -6.47%     
==========================================
  Files          49       49              
  Lines        1589     1590       +1     
==========================================
- Hits         1383     1281     -102     
- Misses        206      309     +103     

Flag	Coverage Δ
unittests	80.56% <100.00%> (-6.47%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/__init__.py	100.00% <100.00%> (ø)
flash/vision/detection/data.py	26.27% <0.00%> (-67.80%)	⬇️
flash/vision/detection/finetuning.py	62.50% <0.00%> (-37.50%)	⬇️
flash/vision/detection/model.py	63.01% <0.00%> (-10.96%)	⬇️
flash/text/seq2seq/core/data.py	79.45% <0.00%> (-5.48%)	⬇️
flash/core/trainer.py	82.50% <0.00%> (-5.00%)	⬇️
flash/core/data/datapipeline.py	96.55% <0.00%> (-3.45%)	⬇️
flash/core/data/datamodule.py	97.77% <0.00%> (-2.23%)	⬇️
flash/vision/classification/data.py	83.33% <0.00%> (-2.00%)	⬇️
flash/vision/backbones.py	91.93% <0.00%> (-1.62%)	⬇️

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