[Fix] Remove outdated code in docs/conf.py

[ckkelvinchan]

Motivation

Fix the error when building HTML (https://readthedocs.org/projects/mmcv/builds/15458392/)

Reference: open-mmlab/mmcv#1560

Modifications

• docs/conf.py
• setup.cfg
• requirements/docs.txt

[codecov]

Codecov Report

Merging #644 (6afeb78) into master (672fe13) will increase coverage by 1.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #644      +/-   ##
==========================================
+ Coverage   79.16%   80.41%   +1.25%     
==========================================
  Files         198      198              
  Lines       11081    11169      +88     
  Branches     1780     1780              
==========================================
+ Hits         8772     8982     +210     
+ Misses       2032     1913     -119     
+ Partials      277      274       -3     

Flag	Coverage Δ
unittests	80.39% <ø> (+1.22%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/datasets/base_dataset.py	100.00% <0.00%> (ø)
mmedit/datasets/base_sr_dataset.py	100.00% <0.00%> (ø)
mmedit/datasets/dataset_wrappers.py	100.00% <0.00%> (ø)
mmedit/datasets/pipelines/compose.py	100.00% <0.00%> (ø)
mmedit/models/synthesizers/pix2pix.py	100.00% <0.00%> (ø)
mmedit/models/losses/pixelwise_loss.py	100.00% <0.00%> (ø)
mmedit/datasets/base_generation_dataset.py	100.00% <0.00%> (ø)
mmedit/datasets/pipelines/generate_assistant.py	100.00% <0.00%> (ø)
mmedit/models/synthesizers/cycle_gan.py	98.85% <0.00%> (+<0.01%)	⬆️
mmedit/models/common/gca_module.py	96.42% <0.00%> (+0.03%)	⬆️
... and 28 more

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